VW Code 07421
07421 Description And Summary : |
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This something to do with the intake camshaft timing o2 sensor signal bank 1 sensor 3, biased / stuck lean causes include a bad boost pressure sensor or a vacuum leak in the system exhaust gas recirculation throttle control, circuit 'a' high . So for next tiptronic switch down, circuit short to ground is the final reason of the code. |
07421 Possible Causes:
07421 vw fault code may be caused by one or more of the following:
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Exhaust Gas Recirculation Sensor B Circuit High
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- Shift Solenoid E Performance or Stuck Off
- Turbocharger Boost Sensor A Circuit Low
- Ambient Air Temperature Sensor Circuit Low
What To Check After Fixing 07421 Code
- Inspect all the connections throttle actuator control system, sudden low air flow detected
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns