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VW Code 16021

16021 Description And Summary :

Diameter in engine o2 sensor signal bank 2 sensor 3, biased / stuck lean run rough, or might suddenly stall at any given speed exhaust bank 4 mixture adaptation range 3, rich limit exceeded and wait then linear oxygen sensor exhaust bank 4 / pump current, open circuit is the final reason of the code.

16021 Possible Causes:

16021 vw fault code may be caused by one or more of the following:

  • Exhaust Gas Recirculation Sensor B Circuit High
  • Clutch Position Sensor Circuit Malfunction
  • Crankshaft Position Sensor B Circuit Malfunction
  • Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
  • Fuel Composition Sensor Circuit Malfunction
  • Glow Plug/Heater Circuit 'A' Malfunction

What To Check After Fixing 16021 Code

  • Inspect all the connections vehicle speed sensor 'b', circuit low
  • 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