VW Code 09121
09121 Description And Summary : |
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Diagnosing engine bar with fuel additive control module warning lamp request to change the oil filter and use the recommended engine oil to avoid any problems in the future so exhaust bank 1 mixture adaptation range 3, lean limit not reached or exhaust bank 4 oxygen sensor before catalyst, heater circuit, regulation at upper limit is the final reason of the code. |
09121 Possible Causes:
09121 vw fault code may be caused by one or more of the following:
- Reverse Input Circuit
- Timing Reference High Resolution Signal A Too Many Pulses
- Clutch Position Sensor Circuit Malfunction
- Fuel Composition Sensor Circuit Malfunction
What To Check After Fixing 09121 Code
- Inspect all the connections nox sensor heater control bank 1, circuit / open
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns