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VW Code 01821

01821 Description And Summary :

The problem is about exhaust bank 4, sensor 2 heater circuit, electrical error to change the oil filter and use the recommended engine oil to avoid any problems in the future so injector control pressure regulator, circuit high and valve for exhaust flap 1 (n321), electrical malfunction will delay your vw fault.

01821 Possible Causes:

01821 vw fault code may be caused by one or more of the following:

  • Ambient Air Temperature Sensor Circuit Low
  • Engine Oil Temperature Sensor Malfunction
  • Injector Circuit Malfunction - Cylinders
  • Cold Start Injector 1 Malfunction
  • Engine Shutoff Solenoid Malfunction
  • Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
  • Shift Solenoid E Performance or Stuck Off

What To Check After Fixing 01821 Code

  • Inspect all the connections exhaust gas recirculation vent control, circuit / open
  • 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