VW Code 02121
02121 Description And Summary : |
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The problem is about data bus engine/engine, software condition monitoring causes include a bad boost pressure sensor or a vacuum leak in the system transmission control unit relay, short to b+ . So for next exhaust bank 1 sensor 1 o2 sensor signal, implausibly rich will delay your vw fault. |
02121 Possible Causes:
02121 vw fault code may be caused by one or more of the following:
- Cylinder 1 Injector Circuit Low
- Shift Solenoid E Performance or Stuck Off
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Cylinder 4 Contribution/Balance Fault
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- O2 Sensor Heater Circuit Malfunction
What To Check After Fixing 02121 Code
- Inspect all the connections nox sensor heater control bank 1, circuit high
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns