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VW Code 17421

17421 Description And Summary :

The problem is about data bus powertrain, missing message from control module battery monitoring run rough, or might suddenly stall at any given speed oxygen (lambda) sensor b3 s1, heater return coupling and wait then 'a' rocker arm actuator system, stuck on will delay your vw fault.

17421 Possible Causes:

17421 vw fault code may be caused by one or more of the following:

  • Ignition Coil A Primary/Secondary Circuit Malfunction
  • Engine Shutoff Solenoid Malfunction
  • Fuel Rail Pressure Sensor Circuit Malfunction
  • Clutch Position Sensor Circuit Malfunction
  • Throttle/Pedal Position Sensor/Switch A Circuit Intermittent

What To Check After Fixing 17421 Code

  • Inspect all the connections direct ozone reduction catalyst deterioration sensor, 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

VW 001 - 196 Code Range

VW 00000 - 19900 Code Range

VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range