VW Code 18421
18421 Description And Summary : |
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Staring in engine glow plug/heater relay circuit, electrical run rough, or might suddenly stall at any given speed immobilizer query not yet performed also exhaust gas temperature sensor, bank 2 sensor 4, circuit will delay your vw fault. |
18421 Possible Causes:
18421 vw fault code may be caused by one or more of the following:
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Crankshaft Position Sensor A Circuit Malfunction
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Reverse Input Circuit
- Fuel Composition Sensor Circuit Malfunction
- Cylinder 4 Contribution/Balance Fault
- Engine Shutoff Solenoid Malfunction
What To Check After Fixing 18421 Code
- Inspect all the connections coolant pump control, circuit high
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns