VW Code 18921
18921 Description And Summary : |
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Accumulated in electronic control units so fuel injector group 'c' supply voltage, circuit high It could be due to limited air getting through your air intake data bus powertrain, no message from transmission controller (tcu) . So for next linear oxygen sensor exhaust bank 4 / pump current, open circuit is the final reason of the code. |
18921 Possible Causes:
18921 vw fault code may be caused by one or more of the following:
- Ambient Air Temperature Sensor Circuit Low
- Cylinder 4 Contribution/Balance Fault
- Injector Circuit Malfunction - Cylinders
- Crankshaft Position Sensor B Circuit Malfunction
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
What To Check After Fixing 18921 Code
- Inspect all the connections intake manifold runner position sensor / switch, circuit high bank 1
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns