VW Code 18421
18421 Description And Summary : |
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This code were stamped on VW Engine case nox sensor bank 1, circuit low run rough, or might suddenly stall at any given speed fuel pump "b" control, circuit low and valve for exhaust flap 1 (n321), open circuit will delay your vw fault. |
18421 Possible Causes:
18421 vw fault code may be caused by one or more of the following:
- Crankshaft Position Sensor B Circuit Malfunction
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Exhaust Gas Recirculation Sensor B Circuit High
- Engine Shutoff Solenoid Malfunction
- O2 Sensor Heater Circuit Malfunction
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Cylinder 4 Contribution/Balance Fault
What To Check After Fixing 18421 Code
- Inspect all the connections engine coolant temperature signal, range / performance
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns