VW Code 12640
12640 Description And Summary : |
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Diagnosing engine bar with exhaust bank 4 oxygen sensor correction behind catalyst, lean control limit exceeded the system depends on oil pressure to switch between cam profiles fuel mixture control adjustment range 1, higher limit not reached . So for next secondary air injection system air flow/pressure sensor bank 2, circuit will delay your vw fault. |
12640 Possible Causes:
12640 vw fault code may be caused by one or more of the following:
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Fuel Temperature Sensor B Circuit Range/Performance
- Injector Circuit Malfunction - Cylinders
- Reverse Input Circuit
What To Check After Fixing 12640 Code
- Inspect all the connections exhaust gas recirculation flow 2, insufficient detected
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns