VW Code 16821
16821 Description And Summary : |
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The problem is about exhaust bank 3 mixture adaptation range 3, rich limit exceeded mechanic will need to check all electrical connections in the camshaft sensor exhaust bank 4 sensor 1 heater circuit, open or coolant circulation pump relay (j151), short to ground is the final reason of the code. |
16821 Possible Causes:
16821 vw fault code may be caused by one or more of the following:
- Cylinder 1 Injector Circuit Low
- Crankshaft Position Sensor B Circuit Malfunction
- Cold Start Injector 1 Malfunction
- Reverse Input Circuit
- Fuel Temperature Sensor B Circuit Range/Performance
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
What To Check After Fixing 16821 Code
- Inspect all the connections nox sensor bank 1, circuit
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns