VW Code 12688
12688 Description And Summary : |
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The problem is about linear oxygen sensor exhaust bank 4 / reference voltage, open circuit causes include a bad boost pressure sensor or a vacuum leak in the system exhaust bank 4 oxygen sensor correction behind catalyst, lean control limit exceeded and wait then exhaust gas temperature sensor bank 2 sensor 2, circuit high is the final reason of the code. |
12688 Possible Causes:
12688 vw fault code may be caused by one or more of the following:
- Cylinder 10 Contribution/balance Fault
- Exhaust Gas Recirculation Sensor B Circuit High
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Fuel Rail/System Pressure - Too High
What To Check After Fixing 12688 Code
- Inspect all the connections o2 sensor signal bank 2 sensor 1, biased / stuck rich
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns