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Vauxhall mokka 1.7cdi o2 – oxygen sensor
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Vauxhall Mokka bad O2 sensor symptoms, causes, and diagnosis
The O2 sensor in the Vauxhall Mokka monitors the level of oxygen in the engine’s exhaust gases and reports the data to the control unit, which continually adjusts the engine’s air/fuel ratio for maximum efficiency. Driving your Mokka with a bad oxygen sensor can damage the engine or catalytic converter, so you must act urgently to avoid costly repairs.
Vauxhall Mokka – (James Hime / Shutterstock)
The most common signs of a bad O2 sensor in Vauxhall Mokka are slow acceleration, loss of power, erratic idling, engine hesitation or judder when accelerating, high fuel consumption, higher tailpipe emissions, foul smell from the exhaust, check engine light comes on and sometimes stalls.
Upstream and downstream O2 sensors
Upstream O2 sensors are important to engine performance
There are several O2 sensors in the Vauxhall Mokka, how many depends on the vehicle configuration and model year. But the most important is the upstream O2 sensor closest to the engine, usually in the exhaust manifold. The upstream O2 sensor helps maintain the correct air-fuel ratio in the combustion chambers for maximum fuel efficiency and engine performance. Any fault in this sensor can cause all sorts of performance issues in your mocha.
Downstream O2 sensors have no effect on engine performance
The downstream O2 sensor in the Mokka is located further down the exhaust system after the catalytic converter and is responsible for measuring the level of pollutants passing through the catalytic converter. The main purpose of the downstream O2 sensor is to ensure that the catalytic converter is working properly. If this sensor goes bad, it won’t affect engine performance, but the check engine light may come on and you may see trouble codes related to catalyst efficiency.
Poor O2 sensors lead to catalytic converter failure
Faulty oxygen sensors are the leading cause of premature catalytic converter failures. If you suspect a problem with the O2 sensor in your Mokka, you should act immediately and have it checked by a professional mechanic. Because O2 sensors are relatively cheap compared to the price of catalytic converters which can easily cost you over a thousand dollars to replace.
Catalysts contain honeycomb structures with tiny pores that are coated with platinum, rhodium or palladium, depending on the stage of the catalyst. If these pores are clogged by improper engine combustion (e.g. due to a bad O2 sensor), the exhaust fumes simply cannot pass through. This chokes the engine and causes performance problems.
How to check the broken O2 sensor in Mocha?
When there is a fault in the oxygen sensor, the check engine light will normally illuminate in the Vauxhall Mokka instrument cluster. You can diagnose the problem by connecting an OBD2 scanner to your vehicle. If you see a trouble code from P0130 to P0135 or from P0150 to P0155, this indicates a problem with the upstream oxygen sensor. You can also use a multimeter to perform a continuity test on the sensor connector to see if the heater circuit is open.
How do I replace the O2 sensor in Mocha?
You do not necessarily have to go to a workshop to replace the lambda probe in your Opel Mokka. All you need for this replacement job is a wrench. Make sure the engine is cold before replacing the sensor to avoid burns.
Locate the O2 sensor to be replaced. Unplug the sensor. Unscrew the O2 sensor with a wrench. Apply anti-seize to the threads of the new sensor. Screw in the new O2 sensor by hand and tighten with a wrench. Connect the electrical connector of the new sensor.
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What causes O2 sensors to fail in Opel Mokka?
All O2 sensors fail over time as it is a consumable item. There is no fixed time limit for failure, but in Mocha they typically last over 100,000 miles. However, they can fail much earlier due to contamination. For example, through silicates that get into the exhaust system through a leaking cylinder head gasket after coolant burns in the engine, or phosphorus through excessive oil consumption through worn piston rings or valve seals.
What happens if you keep driving with a bad O2 sensor?
Driving your Vauxhall Mokka with a bad O2 sensor can result in sluggish and harsh acceleration, as well as high fuel consumption and emissions. And if you keep driving for several months, it can result in engine damage or catalytic converter failure that can cost thousands of dollars to repair or replace.
Can a bad O2 sensor cause bad acceleration?
If the lambda probe breaks down in the Mokka, it does not send the correct measured values to the engine control unit. The optimum amount of fuel can no longer be calculated, resulting in either too little or too much fuel being injected into the combustion chambers. The engine runs too “lean” or too “rich”. Because a rich or lean condition robs a vehicle of power, a bad oxygen sensor can cause poor acceleration.
Can a bad O2 sensor cause tremors?
A defective O2 sensor in the Opel Mokka can certainly lead to tremors or vibrations while driving. When the O2 sensor goes bad, it causes an incorrect air/fuel mixture in the combustion chambers, which can cause the engine to shake. These vibrations are felt in the cabin of the vehicle when driving.
A comparison between new and old O2 sensor.
Will a new O2 sensor improve gas mileage?
According to the EPA, replacing a bad oxygen sensor can improve fuel economy by up to 40 percent. So if your Mokka develops an increased thirst for fuel, you should definitely consider having the oxygen sensor checked or replaced, especially if the vehicle has driven more than 100,000 km.
Use OBD2 scanner to diagnose
Since the Opel Mokka is equipped with an on-board diagnosis (OBD), a fault diagnosis can provide initial indications of where the fault lies.
OBD2 scanners are now available in different versions. You can use a standalone diagnostic tool (see above) or purchase an OBD2 adapter that connects to a smartphone app via Bluetooth or WiFi.
To begin troubleshooting, you must first connect the diagnostic tool to your Mokka. The OBDII connector is usually located under the dashboard. With the tool connected, turn on the ignition. Most diagnostic tools then ask for some information about the vehicle. It is important that you enter this 100% correctly, otherwise the result of the search may be inaccurate. In addition to the vehicle make, model and engine type, you usually also have to enter the vehicle identification number (VIN). As some OBD codes are manufacturer specific, if you fill in more details about your Mokka the scanner can give you more accurate information.
O2 sensor diagnostic trouble codes
Below are all of the error codes that indicate a problem with an oxygen sensor.
P0130 = 02 Sensor Circuit Malfunction (Bank 1 Sensor 1)
= 02 Sensor Circuit Malfunction (Bank 1 Sensor 1) P0131 = 02 Sensor Circuit Voltage Too Low (Bank 1 Sensor 1)
= 02 Sensor Circuit Low Voltage (Bank 1 Sensor 1) P0132 = 02 Sensor Circuit High Voltage (Bank 1 Sensor 1)
= 02 Sensor Circuit High Voltage (Bank 1 Sensor 1) P0133 = 02 Sensor Circuit Respond Slowly (Bank 1 Sensor 1)
= 02 Sensor Circuit Slow to Respond (Bank 1 Sensor 1) P0134 = 02 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
= 02 No Sensor Circuit Activity Detected (Bank 1 Sensor 1) P0135 = 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
= 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) P0136 = 02 Sensor Circuit Malfunction (Bank 1 Sensor 2)
= 02 Sensor Circuit Malfunction (Bank 1 Sensor 2) P0137 = 02 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
= 02 Sensor Circuit Low Voltage (Bank 1 Sensor 2) P0138 = 02 Sensor Circuit High Voltage (Bank 1 Sensor 2)
= 02 Sensor Circuit High Voltage (Bank 1 Sensor 2) P0139 = 02 Sensor Circuit Respond Slowly (Bank 1 Sensor 2)
= 02 Sensor Circuit Slow to Respond (Bank 1 Sensor 2) P0140 = 02 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
= 02 No Sensor Circuit Activity Detected (Bank 1 Sensor 2) P0141 = 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
= 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2) P0142 = 02 Sensor Circuit Malfunction (Bank 1 Sensor 3)
= 02 Sensor Circuit Malfunction (Bank 1 Sensor 3) P0143 = 02 Sensor Circuit Voltage Too Low (Bank 1 Sensor 3)
= 02 Sensor Circuit Low Voltage (Bank 1 Sensor 3) P0144 = 02 Sensor Circuit High Voltage (Bank 1 Sensor 3)
= 02 Sensor Circuit Voltage Too High (Bank 1 Sensor 3) P0145 = 02 Sensor Circuit Response Slowly (Bank 1 Sensor 3)
= 02 Sensor Circuit Responding Slowly (Bank 1 Sensor 3) P0146 = 02 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)
= 02 No Sensor Circuit Activity Detected (Bank 1 Sensor 3) P0147 = 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 3)
= 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 3) P0150 = 02 Sensor Circuit Malfunction (Bank 2 Sensor 1)
= 02 Sensor Circuit Malfunction (Bank 2 Sensor 1) P0151 = 02 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
= 02 Sensor Circuit Low Voltage (Bank 2 Sensor 1) P0152 = 02 Sensor Circuit High Voltage (Bank 2 Sensor 1)
= 02 Sensor Circuit High Voltage (Bank 2 Sensor 1) P0153 = 02 Sensor Circuit Respond Slowly (Bank 2 Sensor 1)
= 02 Sensor Circuit Slow to Respond (Bank 2 Sensor 1) P0154 = 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
= 02 No Sensor Circuit Activity Detected (Bank 2 Sensor 1) P0155 = 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
= 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1) P0156 = 02 Sensor Circuit Malfunction (Bank 2 Sensor 2)
= 02 Sensor Circuit Malfunction (Bank 2 Sensor 2) P0157 = 02 Sensor Circuit Voltage Too Low (Bank 2 Sensor 2)
= 02 Sensor Circuit Low Voltage (Bank 2 Sensor 2) P0158 = 02 Sensor Circuit High Voltage (Bank 2 Sensor 2)
= 02 Sensor Circuit High Voltage (Bank 2 Sensor 2) P0159 = 02 Sensor Circuit Respond Slowly (Bank 2 Sensor 2)
= 02 Sensor Circuit Slow to Respond (Bank 2 Sensor 2) P0160 = 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
= 02 No Sensor Circuit Activity Detected (Bank 2 Sensor 2) P0161 = 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
= 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2) P0162 = 02 Sensor Circuit Malfunction (Bank 2 Sensor 3)
= 02 Sensor Circuit Malfunction (Bank 2 Sensor 3) P0163 = 02 Sensor Circuit Voltage Too Low (Bank 2 Sensor 3)
= 02 Sensor Circuit Low Voltage (Bank 2 Sensor 3) P0164 = 02 Sensor Circuit High Voltage (Bank 2 Sensor 3)
= 02 Sensor Circuit High Voltage (Bank 2 Sensor 3) P0165 = 02 Sensor Circuit Respond Slowly (Bank 2 Sensor 3)
= 02 Sensor Circuit Responding Slowly (Bank 2 Sensor 3) P0166 = 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 3)
= 02 No Sensor Circuit Activity Detected (Bank 2 Sensor 3) P0167 = 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 3)
Conclusion
If you notice a noticeable loss of performance or engine standstill in your Opel Mokka with high fuel consumption, you should definitely think of a defective upstream lambda sensor. Even if your vehicle shows no signs of problems, it is recommended that the upstream O2 sensor be replaced after 100,000 miles for optimal engine performance and fuel economy.
In any case, a visit to a workshop is advisable for laypeople. A professional mechanic can quickly diagnose the problem for you.
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