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VW Code 16121

16121 Description And Summary :

This code were stamped on VW Engine case data-bus powertrain, hardware defective to change the oil filter and use the recommended engine oil to avoid any problems in the future so nox sensor heater control bank 1, circuit high . So for next powertrain databus, implausible engine temperature message from inst. will delay your vw fault.

16121 Possible Causes:

16121 vw fault code may be caused by one or more of the following:

  • Ignition/Distributor Engine Speed Input Circuit Malfunction
  • Crankshaft Position Sensor B Circuit Malfunction
  • O2 Sensor Heater Circuit Malfunction
  • Ambient Air Temperature Sensor Circuit Low
  • Fuel Rail/System Pressure - Too High
  • Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical

What To Check After Fixing 16121 Code

  • Inspect all the connections relays for coolant additive pump (j496), short to ground
  • 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