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What does the exhaust gas pressure sensor do?
The Exhaust Gas Pressure Sensor is a Differential Sensor measuring the pressure difference between gas in the intake and the outtake of the Particulate Filter. The outtake may be directly set to ambient pressure depending on the model.
How do you check exhaust pressure sensor?
Using a pressure gauge, measure the pressure of both hoses. For sufficient accuracy, use an exhaust back pressure gauge that measures 0-15 PSI. Check the signal voltage again. The voltage should read a number between the pressure values of the hoses.
Where does the exhaust pressure sensor go?
Usually, you’ll find the sensor bolted onto the side or bottom of the engine, or along the firewall in the back of the engine well.
Can I clean a DPF myself?
Never attempt to remove a DPF and to start forced regeneration. This should only be done by a qualified mechanic, as it’s easy to accidentally damage your vehicle.
Making sense of your sensors: DPF differential pressure sensor
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What happens if DPF pressure sensor fails?
Symptoms of a failed or failing dpf pressure sensor? Symptoms can be loss of power, reduced fuel economy, poor throttle response, limp home mode, these are some causes, mis calculating the soot content in the DPF.
Making sense of your sensors: DPF differential pressure sensor
Can you clean an exhaust gas temperature sensor?
Handle the exhaust gas temperature sensor carefully, dropping the component may cause unseen damage to the cement that secures the thermistor. 3. If the sensor is threaded, clean the thread in the exhaust pipe with a cleaning tap.
Making sense of your sensors: DPF differential pressure sensor
Changes in temperature lead to changes in the resistance of the sensor, which are transmitted to the ECU as a voltage.
In a TechAssist bulletin, Lucas explains that these sensors protect key exhaust components from overheating and help control emissions.
They are also used in multiple combustion control processes in diesel and gasoline engines, including selective catalytic reduction (SCR), turbocharging, exhaust gas recirculation, and DPF regeneration.
A faulty sensor reporting incorrect voltages can result in poor fuel efficiency as DPF regeneration takes longer to complete.
DPF regeneration
The DPF regeneration process can affect drivability.
Faulty exhaust gas temperature sensors can result in unnecessary regenerations causing driver inconvenience.
Lucas says some sensors are harder to diagnose than others.
PTC sensor failures are often misdiagnosed as DPF problems because they continue to function after the failure, sending incorrect signals to the ECU that interfere with the DPF regeneration process.
NTC sensors are more likely to trigger the check engine light if they fail.
Extreme heat is often a cause of failure over time.
According to Lucas, a common problem with all wired sensors is that wires can break, especially when subjected to severe twists and turns.
They are also easily damaged when replacing other components in the exhaust system.
For this reason, Lucas recommends replacing the exhaust gas sensors at the same time as the exhaust system or components such as the DPF or KAT.
Exhaust gas temperature sensors have many features that help them withstand vibration, but they can still take their toll over time.
Installation instructions 1. Make sure that the exhaust system has cooled down before you start work. 2. Handle the exhaust gas temperature sensor carefully, dropping the component may cause invisible damage to the cement securing the thermistor. 3. If the sensor has a thread, clean the thread in the exhaust pipe with a cleaning tap. 4. Apply copper grease to the sensor threads only. Although some sensors are pre-greased, additional grease will prevent thread galling and reduce friction, which could result in over-torque (especially with stainless steel threads). Torque wrench to avoid over-tightening and/or damaging the wire. 6. Start the engine and check that the exhaust system is working properly. A reset of the ECU may be necessary.
With just 100 part numbers, Lucas Electrical’s range of exhaust gas temperature sensors covers over ten million vehicles on the road.
To learn more about and view Lucas Electrical’s range of exhaust gas temperature sensors, select “More Details” below.
What are symptoms of exhaust back pressure?
The symptoms of exhaust back pressure include reduced engine power, poor fuel economy, slipping transmission in the case of automatic cars, altered shift points, among others.
Making sense of your sensors: DPF differential pressure sensor
What is exhaust back pressure?
Exhaust back pressure is the phenomenon that causes a significant drop in pressure coming from the engine. Any liquid fuel passed through a pipe leaves a resistance on the walls of the pipe. The thickness of the resistor depends on many factors, including the viscosity of the fluid, the smoothness of the inside of the tube, and the diameter of the tube, but any resistance will result in a reduced pressure flowing through the tube. The pressure drop takes place throughout the tube, which means that the pressure entering one end of the tube is lower than the pressure exiting the other end – the effect known as back pressure. Back pressure is detrimental to the engine and is a problem that needs to be addressed as soon as possible. The symptoms of exhaust back pressure include reduced engine performance, poor fuel consumption, slipping gears in automatic cars, changed shift points. In very severe cases, the problem can seriously affect the vehicle’s drivability by causing the EGR valve to recycle too much gas, or even cause the engine to stop running entirely. If you notice any of these problems, take the car to your exhaust system mechanic immediately such as http://budsmuffler.com/catalytic-converters/ – the signs of the fault can be frightening, but the problem can be fixed relatively easily.
How do you know if your DPF is clogged?
- You feel a loss of power in your engine (limp mode).
- The DPF light will appear on your dashboard.
- Passive and active regeneration keep failing.
- A pungent smell of diesel.
- Automatic Stop-Start System Not Working.
- Your car seems to be releasing an excessive amount of smoke.
Making sense of your sensors: DPF differential pressure sensor
How does a DPF filter become clogged? If you think about it, like any other filter, there may come a time when it becomes clogged and needs to be emptied and cleaned. The filter is equipped with two processes for this scenario: passive and active regeneration. In summary, passive regeneration is when you drive on the freeway at a reasonably high speed for at least half an hour so that the temperature of the exhaust gas gets high enough to burn off the soot trapped in the filter. However, some people rarely drive long highway trips and mainly stick to short trips in urban areas, which is the usual cause of premature failures. Short journeys do not allow the diesel engine to run constantly and long enough to generate optimal temperatures in the exhaust gas. For this reason, active regeneration was developed. During this process, the engine control unit (ECU) detects that soot formation has reached the preset limit (which is approximately 45%) and then injects additional fuel to increase the exhaust gas temperature. This in turn urges the filter regeneration process to start and burn off the collected soot. After this procedure, the results of this regeneration allow the clogged filter to work efficiently again. For a more detailed explanation of what a diesel particulate filter is and the two regenerations, read our article: What is a DPF filter. If you find yourself in a situation where neither passive nor active regeneration seems to clear the blocked filter, you may have a bigger blockage than you thought.
What are the signs of a blocked DPF? The main and most obvious sign that you have a problem with the filtration system is when the DPF warning light comes on on your dash to warn you that it needs to be regenerated in order to clean itself. If the DPF light is accompanied by the engine management light, the situation may have already escalated into a more serious issue and needs to be diagnosed with a diagnostic scanner. The main and most obvious sign that you have a problem with the filtration system is when the DPF warning light comes on on your dash to warn you that it needs to be regenerated in order to clean itself. If the DPF light is accompanied by the engine management light, the situation may have already escalated into a more serious issue and needs to be diagnosed with a diagnostic scanner. Here are some other signs to look out for when troubleshooting a DPF issue: You will feel a loss of power in your engine (limp home mode).
The DPF light will appear on your dashboard.
Passive and active regeneration fail again and again.
A penetrating smell of diesel.
Automatic stop-start system does not work
Your car seems to be emitting excessive smoke.
An increase in the oil level.
You have noticed increased fuel consumption. If the scenario occurs where both passive and active regeneration fails, another light may illuminate on your dashboard to alert you to this fact and in this case you may need our dedicated DPF cleaning service. There are some short-term solutions to a clogged filter, including a process called forced regeneration or using chemical additives, but this won’t remove the ash, just the soot. Rather than wasting money on a very temporary fix, we recommend you consider our thorough DPF cleaning service, which will effectively remove soot and ash! With this cleaning service we ensure that only the latest advanced technology is used to clean your device to get it working efficiently again.
What does this DPF cleaning process consist of? With this service, you can guarantee that your exhaust filter will be restored to health and will operate to its full capacity in no time, unless it has suffered some kind of internal damage, in which case you may need to replace it. Don’t worry if a replacement is required, we offer a bespoke DPF replacement service that is guaranteed to save you money! What does this cleaning process involve? 1) When you bring your vehicle in, we will first conduct a diagnostic session on the vehicle to create a log of all fault codes stored and active in the ECU. We then proceed to remove the filter from the exhaust. 2) Next, the inside of the filter is thoroughly inspected (by endoscopic inspection) to look for internal damage. In addition, some pictures are taken before the device is subjected to deep cleaning. 3) A back pressure test is then performed to check the severity of the clog. 4) Once the test is complete, the filter is placed in a high-tech cleaning machine and then subjected to a two-way cleaning with a water-based solution and a thorough drying process to ensure soot and ash are completely removed. 5) To confirm the successful results of the deep cleaning, another back pressure test is now performed. 6) Another interior inspection is carried out along with some more photos of the now clean interior of the filter unit. 7) The cleaning process performed on the device is certified and has a one-year guarantee. 8) The filter is then reinstalled on the vehicle. At this stage a diagnosis should be run and the relevant ECU reset.
How long can you drive with DPF light on?
The DPF warning light will automatically clear off within 30 minutes of driving as the additive circulates within the fuel system. So, instead of asking, “How long can you drive with DPF light on?” It would be best to fix the problem immediately.
Making sense of your sensors: DPF differential pressure sensor
The exhaust gases of a vehicle inevitably become sooty over time due to constant combustion. The particulate filter is designed to remove soot from the exhaust. However, the filter can clog over time.
Ignoring soot formation can be harmful in the long run. One of the early symptoms to deal with is the DPF warning light. Find out what is triggering the light and how to fix it in the sections below.
What Causes Diesel Particulate Filter Warning Light?
The main cause of the diesel particulate filter (DPF) warning light is a clogged particulate filter. The warning light indicates that the onboard computer system has detected excessive soot buildup in the particulate filter, which is likely to trigger limp home mode.
Another cause for the DPF warning light to come on is a faulty pressure or temperature sensor. If this component is not working, it will send incorrect signals to the on-board computer system, which may unnecessarily trigger the DPF warning light.
However, excessive soot build-up in a vehicle’s particulate filter is the main reason why the DPF warning light comes on.
How do I fix my diesel particulate filter warning light?
If a vehicle’s diesel particulate filter becomes clogged with too much soot over time, there is a risk that the vehicle will go into limp mode. This can be a serious problem for your vehicle so you need to get it fixed as soon as possible.
The solutions below will help you understand how to fix the diesel particulate filter warning light problem in your car. Make sure to carefully implement the recommended solutions below to clear the DPF warning light.
Drive past 40 mph to trigger regeneration
The most common fix for the DPF warning light indicator is to drive above 40 mph. If you do this, get out of the busy region of your city and find a long stretch of freeway.
Once on the road, cruise at a brisk 40+ mph while monitoring the engine to keep it at around 2500 rpm. This automatically triggers an active regeneration, which in turn increases the temperature.
At this point, the clogs are converted to gas and exit through the exhaust. Be sure to stretch the car for up to 15 to 30 minutes. After that, the DPF warning light should go off.
Apply DPF cleaning additive
An alternative approach to cleaning a clogged DPF filter is to use a DPF additive. You can get a good DPF cleaner for as little as $13-$26 and put the solvent in your vehicle’s fuel tank.
When applying the amount, be sure to follow the manufacturer’s recommendation. After that, start the vehicle and drive for about 15 to 30 minutes.
The DPF warning light will turn off automatically within 30 minutes of driving if the additive is circulating in the fuel system. So instead of asking, “How long can you drive with the DPF light on?” It’s best to fix the problem right away.
frequently asked Questions
Q: What to do when the particulate filter light comes on?
The particle warning light is something to be aware of. Don’t panic because you can solve the challenge in a moment. So if the particulate matter warning light comes on automatically in your car, drive your car onto the motorway immediately.
Once you’re sure you have a clear road to drive non-stop, stretch the car by driving about 15 to 30 at a speed in excess of 40 miles per hour
Q: Is it ok to drive with the DPF light on?
Driving with your car’s DPF light on is not ideal. Although the car may not have any problem moving on the road, in the long run the problem can be serious. If you completely ignore the DPF light, you risk your car’s filter building up enough soot to clog the filter.
Once soot build-up reaches a certain level at which the filter becomes clogged, your car will automatically switch to a limp home mode to protect the engine from damage.
Finally, limp home mode changes the proper functioning of several components in your car to ensure the engine is protected. In this case, you may not be satisfied with driving a car.
Q: What does the diesel particulate filter light mean?
The diesel particulate filter warning light in Nissan Navara is the same as the diesel particulate filter warning light in VW Golf.
When this light comes on in a car with a diesel engine, it means that the amount of soot in the car’s exhaust is so high that it can trigger limp home at any time.
Don’t panic when the light comes on in your car. You can fix the problem within minutes. Just drive out of the busy region of your city onto a highway where you can drive at high speeds.
When you get onto the freeway, accelerate and drive at speeds in excess of 40 mph for about 15 to 30 minutes. As soon as you do this, the temperature rises and the vehicle’s filter is regenerated; then turn off the warning light.
Q: How do I clean my DPF filter myself?
Manually cleaning your vehicle’s DPF filter is another way to eliminate soot build-up. All you need is a good DPF cleaner with an additive. The DPF cleaner neutralizes the soot deposits that clog the filter.
Once you’ve gotten a good DPF cleaner, turn off your car and open the gas cap. Then pour the recommended amount of cleaner into the tank and replace the tank cap. After that, start the car and drive around for about 15-30 minutes to get the DPF cleaner working effectively.
Once you finish using the DPF cleaner and drive for the recommended amount of time, the warning light should go out on its own. Then you can return to normal everyday driving. So if your car’s diesel particulate filter warning light is flashing, make sure you get it fixed as soon as possible.
Q: How much does it cost to clean a diesel particulate filter?
Cleaning a vehicle’s diesel particulate filter (DPF) is an important task. Only experienced DIYers can do the job perfectly without damaging the filter. Therefore, you need to contact a professional auto mechanic to get the job done if you are not sure if you are doing it well.
The cost of cleaning a diesel particulate filter is around $85-$100. However, if the filter is completely blocked, you may need to budget for up to $300.
If you are considering whether or not your Nissan X Trail Diesel Particulate Filter warning light needs repairing, please be aware that failure to do so can trigger limp home and pose a serious challenge to your vehicle in the long run.
last words
The essence of understanding what to do when the diesel particulate filter warning light comes on cannot be overstated. The exercise is likened to a life saver for your car; Otherwise, you risk the car going into limp mode.
The cause of the DPF warning light display and the solution have been revealed above. Pay attention to these factors to avoid complications.
If your car’s DPF warning light is already tripping, simply apply the recommended solutions in this article as soon as possible. However, if you are not sure that you can fix the problem perfectly, please contact an auto mechanic to help you.
Learn more:
Can a blocked DPF cause low fuel pressure?
While most vehicles are equipped with a regen style filter, single use DPF filters still do exist. It’s very important to keep your DPF as clean as possible because a clogged DPF can cause motor and turbo failures due to an increase in back pressure which will also decrease fuel efficiency as well.
Making sense of your sensors: DPF differential pressure sensor
Unfortunately, nothing lasts forever and these filters wear out like anything else. Most have a typical life expectancy of around 5,000 hours, which can range from 150,000 miles to 250,000 miles. These filters are made of ceramic and are designed to withstand the high temperatures coming out of the exhaust manifold. Over time, blockage/clogging problems arise when soot levels get too high and clog the filter, restricting exhaust flow through it. While most vehicles are equipped with a regeneration filter, disposable DPF filters still exist. It is very important to keep your DPF as clean as possible as a clogged DPF can lead to engine and turbo failures due to increased back pressure which also reduces fuel efficiency.
Common causes of a DPF failure:
Driving/idling times in the city
not reach operating temperature
Do not allow regeneration to complete
bad fuel
wrong or bad engine oil
When soot begins to clog the DPF, the engine will request a regeneration or regeneration. While some engines can automatically go through a regeneration cycle, others need to be regenerated manually or, in extreme cases, go through forced regeneration. Typically, engines can be run at highway speeds for extended periods of time, which cleans the filter of minimal soot build-up. However, manual regeneration is required when back pressure builds up beyond a certain level. In this case, the vehicle must come to a complete stop to regenerate before the system shuts off the engine, or worse, engine failure occurs. A manual regeneration can be performed using either a factory-equipped dashboard button or a software-equipped support laptop. In either case, this requires the vehicle to go off the road – costing time and money while delaying the work at hand. Not only is there a cost in man hours lost by the operator sitting around doing nothing for 45 minutes or more, but a machine that isn’t running is a machine that isn’t bringing revenue to its owner!
As mentioned above, prolonged idling and city driving can severely affect DPF systems. Most of the time we can’t avoid this driving behavior, but we can take preventive measures by making sure we always buy quality fuel and motor oil. Using a reputable fuel supplier is a long-term preventive tool; A good fuel product protects your engine, reduces wear and extends the life of your DPF. Quality motor oil is also a valuable part of your DPF health. New high-performance diesel engine oils help reduce ash and soot buildup in your DPF filter by nearly 60%. A high-quality engine oil also protects your engine from failure.
Another way to protect your DPF is to use an exceptional fuel additive – one that contains a combustion catalyst. We offer the Fuel Ox with Combustion Catalyst, a combustion catalyst that drastically reduces the chance of DPF filter failure. The introduction of Fuel Ox with Combustion Catalyst into your fuel improves the combustion process and provides a more thorough burn and therefore a cleaner burn. It reduces soot and carbon deposits so fewer emissions are actually caught by the DPF. Fewer emissions mean less regeneration. In fact, our customers report over 50% less regeneration when using Fuel Ox with Combustion Catalyst. If you have any questions about how to extend the life of your DPF, please contact us at [email protected] or at 1.844.8.FUELOX.
How do you reset a DPF sensor?
- Jack up the vehicle. Disconnect the battery. …
- Remove the dosing pump hose(s) (3). Remove the additive reservoir from the housing (1). …
- Fit in the reverse order. Reset the level display to zero. …
- Select the vehicle as shown in the illustration. …
- Further information. …
- Tools and equipment.
Making sense of your sensors: DPF differential pressure sensor
Brand model system Peugeot 308 (08-10) diesel systems
summary
This function can be used to reset the additive level counter in the tank calculation. This operation must only be performed after replacing or topping up the additive reservoir according to the vehicle’s maintenance instructions (74,500 miles). Always use a new container of the same type.
ATTENTION
Diesel additive must not come into contact with the painted surfaces of the vehicle.
Steps to reset the DPF additive level:
Step 1:
Jack up the vehicle.
disconnect the battery.
Release fastener(s) (1).
Remove the cover(s) (2).
(see figure)
Step 2:
Remove metering pump hose(s) (3).
Remove the additive tank from the housing (1).
(see figure)
Step 3:
Install in reverse order.
Reset the level indicator to zero
Refill via the Delphi diagnostic bank, reset the level indicator to zero.
Step 4:
Select the vehicle as shown in the image.
test conditions
Ignition on, engine off.
All electrical consumers separated.
Battery voltage greater than 12V.
Additive tank filled or replaced.
procedure
Start communication with the vehicle and select the “Settings” function. Follow the program instructions. Disconnect the diagnostic tool when finished. The process is over.
If the operation fails, review the test conditions and handle any error codes found.
Step 5:
Further information
Part Number Description DDNXX330 Common Rail General Manual for 2.0 HDi 16v
Step 6:
tools and equipment
Is it possible to clean an o2 sensor?
Can you clean an oxygen sensor? No, despite what you might have heard or read, such sensors should be replaced when they become faulty.
Making sense of your sensors: DPF differential pressure sensor
Locate your oxygen sensors
You probably don’t know something is wrong with an oxygen sensor until an emergency code appears on the dashboard. Otherwise your car may run poorly with a noticeable drop in fuel efficiency.
The number of oxygen sensors present varies depending on the engine type. Typically on transverse four cylinder engines you will find two sensors – one is upstream and one is downstream. In-line four, in-line six and V6 and V8 engines each have three sensors, one on each engine bank and a third downstream. Transversely mounted V6 and V8 engines have four sensors, including one on each bank, one downstream, and fourth at the rear of the engine.
All you need is a faulty oxygen sensor causing problems for your vehicle. So you need to determine which sensor is faulty.
Replace, not clean
You may have found information on how to clean an oxygen sensor on the internet. Usually, these instructions are fairly detailed, explaining how to carefully remove the sensor, apply a cleaning agent, and return the device to its previous location.
However, this information is misleading as oxygen sensors are designed to be replaced, not cleaned. No car manufacturer supports the cleaning of sensors. In fact, you always risk voiding a warranty by attempting to clean a sensor and something going wrong later. If you find that your car has a faulty oxygen sensor, here is how you can replace it.
Test your oxygen sensor
Oxygen sensors can be tested for effectiveness. This works by using a digital voltmeter and a rear probe. Once the surrounding wiring has been examined and ruled out as a possible problem, start the car and allow it to run until the engine exhaust temperature reaches at least 600 degrees Fahrenheit.
The voltmeter and rear probe are then used to measure a specified number of points under specified conditions. As you can imagine, experienced mechanics are often called in to test oxygen sensors. This also ensures that the correct defective oxygen sensor is identified and replaced, saving you money.
Can you clean an oxygen sensor? Yes, technically you can. However, it is not recommended as the intention is to replace the component if there is a problem. Cleaning an oxygen sensor requires more work than replacing the component, and after locating the part and verifying that it is working effectively, you can put your mind to the future replacement path.
Check out all the relays, sensors and switches available on NAPA Online, or trust one of our 17,000 NAPA AutoCare locations for routine maintenance and repairs. For more information on how to replace your car’s oxygen sensors, chat with a knowledgeable expert at your local NAPA AUTO PARTS store.
Photo courtesy of Wikimedia Commons.
Nissan Qashqai Juke P0470 Exhaust Pressure Sensor A Circuit Fix
See some more details on the topic nissan qashqai exhaust pressure sensor pipe blocked here:
Exhaust pressure sensor pipe – Nissan QashQai Forums
I have a blocked exhaust pressure sensor pipe on my 1.5DCi 2011 Qashqai. Took me about an hour to find the pipe!
Source: www.qashqaiforums.co.uk
Date Published: 4/14/2022
View: 4735
Nissan qashqai in for common fault… – GB Services & Repairs
Nissan qashqai in for common fault with the exhaust pressure pipe blocking. 30 minute job turns in to a complete nightmare . Bolt deces to snap in the…
Source: www.facebook.com
Date Published: 4/24/2021
View: 3214
Nissan Qashqai 1.5 Diesel – how long to change dpf pressure …
After lots of searching (including this forum) I believe the cure is to remove and clean a pressure pipe between the exhaust manifold and the …
Source: www.bba-reman.com
Date Published: 12/14/2022
View: 5001
Exhaust pressure sensor for NISSAN Qashqai II (J11) 1.5 dCi …
Supplementary Article/Info 2: without connector parts, without connecting pipe; Pressure from [kPA]: 0,2; Pressure to [kPA]: 100 …
Source: www.123spareparts.co.uk
Date Published: 2/30/2022
View: 2240
DPF EXHAUST DIFFERENTIAL PRESSURE SENSOR & PIPE …
DPF EXHAUST DIFFERENTIAL PRESSURE SENSOR & PIPE for NISSAN JUKE QASHQAI 1.5 dCi ; Reference OE/OEM Number: 44 06 819, 4406819, 44 20 807, 4420807, 95 515 330, …
Source: www.ebay.co.uk
Date Published: 4/18/2021
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Problem with a NISSAN QASHQAI 1.5 L DCi 2012 48k
EML on due to a DPF fault and vehicle unable to run due to excessively blocked DPF. Fault code stored P047B exhaust gas pressure sensor …
Source: www.problemwithavehicle.com
Date Published: 1/26/2022
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Sensor, exhaust pressure for Nissan QASHQAI – Mister Auto
Sensor, exhaust pressure Nissan QASHQAI ➤ Fast and Free shipping available ✚ Car parts for all car makes and models ✚ The Biggest Brands At …
Source: www.mister-auto.ie
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Exhaust pressure – Nissan Juke Owners Club
Exhaust pressure sensor juke 1.5 dci 2013 … the hose due to the bends in the pipe but it will go ,my pipe was blocked about 2 inches from …
Source: www.jukeownersclub.co.uk
Date Published: 4/17/2021
View: 434
Exhaust pressure sensor pipe
Post by brrrrummm_brum » Sat 29.08.2020 21:09
I have a clogged exhaust pressure sensor tube on my 1.5DCi 2011 Qashqai. It took me about an hour to find the pipe! It’s on the back of the motor and I understand it can be unlocked with a bike brake cable and a drill.
The problem is getting there. I’m trying to loosen the tube under the sensor but I can’t do it with my fingers and I can’t get pliers in. Do I have to remove the sensor? Looks like a large 22mm deep socket is required for this.
I have a P242 trouble code, blocked DPF, but I think it’s not regenerating due to this blocked sensor tube.
Exhaust Gas Pressure Sensors
The sensing element of the exhaust pressure sensor is a piezoresistive On in a Wheatstone bridge configuration. This sensor is basically
Change in its electrical resistance when the membrane is mechanically deformed.
The sensor element is integrated in a MEMS chip, including amplification, thermal compensation and signal conditioning. The embedded digital
Electronics allow the output signal to be programmed from 0 to 5V.
The chip is mounted on a ceramic circuit and the electrical connection is made by wire bonding. The whole system is protected by a socket
and a silicone gel. The electronics are manufactured using hybrid technology and handled in a clean ESD protected room to protect them from unwanted influences
electrical discharges
The output of the exhaust gas pressure sensor is linear and depends on the pressure difference between the input and output. This relationship can be expressed
with the following formula:
Vout = S*ΔP+Of Vout: Output Voltage (V).
S: sensitivity.
ΔP: pressure difference between
Filter inlet and outlet (kPa).
From: Offset.
Technical specifications:
– Supply voltage: 5V ±0.5V. – Temperature range: -20ºC to 130ºC (within tolerance). – Maximum and minimum temperatures: -40ºC to +150ºC. – Response time (t 10/90): 1.5 ms. – Max. pressure: ±400 kPa (+30 °C for 5 s).
All of these numbers apply to all exhaust pressure sensors. Each part has its specific working curve and tolerances
Making sense of your sensors: DPF differential pressure sensor
A diesel particulate filter (DPF) differential pressure sensor measures exhaust back pressure and signals when the powertrain control module (PCM) should begin a regeneration process to rid the filter of diesel particulate matter (DPM) or soot. The DPF differential pressure sensor plays an important role in making the DPF work properly. A clogged DPF is not only a costly repair, it can also be disastrous for your diesel engine. To understand how the DPF differential pressure sensor works, why it fails and how to replace it in this case, let’s briefly discuss the DPF.
What is the DPF and how does it work?
As strict emission regulations to reduce emissions increase, diesel engines use an EGR valve to reduce NOx emissions and a DPF to remove soot from diesel exhaust. Installed near the beginning of the exhaust system, the wall-flow design of the DPF captures an average of 85% of the soot coming from the engine and can even reach 100% efficiency under certain conditions. To keep the filter from clogging, the engine initiates a regeneration process by injecting fuel into the exhaust system. The injected fuel raises the temperature of the DPF to 600°C (or 1112°F), allowing the offending soot to burn off by turning it into ash. On some vehicles, the PCM relies on data from the DPF differential pressure sensor to initiate the DPF regeneration process.
How does a DPF differential pressure sensor work?
The DPF differential pressure sensor is usually mounted in the engine compartment to protect it from heat. The sensor is connected to the engine control unit (ECU) via an electrical connector and is connected to the DPF via two silicone hoses. One hose is connected before (upstream) the DPF, the other after (downstream) the filter. By measuring and comparing the pressure difference of the exhaust gas before and after the filter, the sensor can estimate the amount of DPM trapped in the filter and signal the PCM to start the DPF regeneration process.
Why do DPF differential pressure sensors fail?
As with any electrical sensor in an engine, wires to the ECU can be damaged by excessive vibration or cracked and melted by extreme heat. And just like the DPF, the sensor hoses can also become clogged with soot in the exhaust. If diesel particulate matter blocks one or both of these airways to the sensor, the sensor can no longer accurately determine pressure changes, which can result in catastrophic damage to the DPF and ultimately the engine.
What to look out for with a defective DPF differential pressure sensor?
When the DPF differential pressure sensor stops signaling the PCM to regenerate, the DPF can become completely clogged with debris and fail. Here are some signs that the DPF is not regenerating properly due to a defective DPF sensor:
Poor engine performance
Bad fuel consumption
High engine temperatures
High transmission temperatures
An increase in black smoke (soot) from the exhaust
Check the engine light
If the DPF fails, the exhaust gases cannot be fully scavenged because back pressure forces the exhaust gases back into the combustion chamber, causing DPM or soot to mix with the engine oil. Soot is abrasive and, in combination with oil, leads to premature wear of the engine bearings. Even the fuel that should escape through the exhaust during regeneration only partially burns. This leftover fuel then washes away the protective oil film on internal engine components and causes catastrophic failure.
A DPF pressure sensor is vital to the longevity of the DPF and if the DPF is completely clogged the regeneration process will not repair it. It must either be removed and professionally cleaned or replaced, both options costing thousands of dollars on average. Much more than the cost of diagnosing and replacing a faulty sensor before it’s too late.
Common Error Codes
If your check engine light is on, here are the codes associated with a DPF sensor.
P2452: Diesel Particulate Filter Pressure Sensor “A” Circuit
: Diesel Particulate Filter Pressure Sensor ‘A’ Circuit P2453: Diesel Particulate Filter A Pressure Sensor Circuit Range/Performance
Diesel Particulate Filter Pressure Sensor A Circuit Range/Performance P2454: Diesel Particulate Filter Pressure Sensor “A” Circuit Low
: Diesel Particulate Filter Pressure Sensor “A” Circuit Low P2455: Diesel Particulate Filter Pressure Sensor A Circuit High
Note: An exhaust leak can cause these codes to set.
Troubleshooting a DPF differential pressure sensor
When troubleshooting engine sensors, it is recommended that you first look for signs of visible damage. Check all connections, starting with the sensor’s electrical connection, and look for damage such as cracking or melting. Any damaged wires must be replaced.
Next, check the tubing connected to the sensor. Check again for damage such as cracks or melting. If the hoses are damaged they will need to be replaced and most likely rerouted so they don’t get damaged in the same way again. If the hoses appear to be in good condition, check for blockages or clogs. When clogged, the hoses must be cleaned or replaced.
If everything passes the physical inspection, you can test the DPF differential pressure sensor with a multimeter set to 20V and a pressure gauge.
With the battery switched on and the engine switched off, connect the earth of the multimeter to the negative pole of the battery and carry out a quick plausibility check by checking the battery voltage. It should be around 12.6 volts. Consult the manufacturer’s service manual to identify the signal, ground, and 5 volt reference and do a back check of the wires. Switch on the ignition without starting the engine. The multimeter should (usually) read between 4.5 and 5 volts for the 5 volt reference, a constant 0 volts for the ground wire, and between 0.5 and 4.5 volts for the signal wire. Consult the OEM factory service information for the exact specifications of your vehicle. Start the engine with the signal cable traced backwards. Run the engine up and see if the voltage changes. If not, proceed to test the connecting hoses with a pressure gauge. With the engine still running, remove the hoses from the sensor. Measure the pressure of both hoses with a manometer. For reasonable accuracy, use an exhaust back pressure gauge that reads 0-15 PSI. Check the signal voltage again. The voltage should show a number between the pressure readings of the hoses. For example, if the rear hose reads 1/2 PSI and the front hose reads 1 PSI, the signal wire voltage should be somewhere in the middle, around 0.8 volts.
If your voltage is wildly out of line or the pressure readings don’t match the voltage reading, the DPF differential pressure sensor is faulty and needs to be replaced.
How to replace a faulty DPF differential pressure sensor
Before replacing a faulty DPF differential pressure sensor, consult the manufacturer’s service manual for specific instructions. If you need more room to get under your vehicle, secure the rear wheel and set up jack stands to support the vehicle.
Locate the DPF differential pressure sensor mounted in the rear of the engine compartment. Disconnect the electrical plug. Remove any screws or bolts (sometimes Torx bolts) securing the sensor. Gently slide the sensor out of the way to loosen the screw clamps holding the tubing. Before disconnecting the sensor, make sure which side goes with which hose. Compare the new and old sensors. Reconnect the tubing to the new sensor in the same position. Tighten the screw clamps on the hoses. Reinstall any screws or bolts holding the sensor in place. Reconnect the electrical connector to the new sensor. Double check all connections to make sure everything is secured.
Important note: After installing a new DPF differential pressure sensor, the sensor offset must be programmed into the ECU.
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