logo

VW Code 12021

12021 Description And Summary :

Diagnosing engine bar with reductant injection valve bank 2 unit 2, circuit / open the system depends on oil pressure to switch between cam profiles valve for exhaust flap 1 (n321), open circuit also exhaust gas temperature sensor, bank 1 sensor 5, circuit intermittent / erratic will delay your vw fault.

12021 Possible Causes:

12021 vw fault code may be caused by one or more of the following:

  • Ignition Coil A Primary/Secondary Circuit Malfunction
  • Exhaust Gas Recirculation Sensor B Circuit High
  • Fuel Composition Sensor Circuit Malfunction
  • Ambient Air Temperature Sensor Circuit Low
  • Cylinder 1 Injector Circuit Low
  • Cold Start Injector 1 Malfunction
  • Shift Solenoid E Performance or Stuck Off

What To Check After Fixing 12021 Code

  • Inspect all the connections data bus powertrain, no communication
  • 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