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VW Code 07421

07421 Description And Summary :

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

VW 001 - 196 Code Range

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VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range