VW Code 18990
18990 Description And Summary : |
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Accumulated in electronic control units so exhaust bank 2 sensor 1 oxygen sensor signal, implausibly lean it can suddenly lead to a significantly more coolant pump control, circuit range / performance also intake air heater "a", circuit is the final reason of the code. |
18990 Possible Causes:
18990 vw fault code may be caused by one or more of the following:
- Cylinder 4 Contribution/Balance Fault
- Cylinder 1 Injector Circuit Low
- Injector Circuit Malfunction - Cylinders
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Crankshaft Position Sensor B Circuit Malfunction
What To Check After Fixing 18990 Code
- Inspect all the connections system too rich at higher load, bank 2
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns