VW Code 18421
18421 Description And Summary : |
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The problem is about a/c refrigerant pressure sensor 'b', circuit range / performance It could be due to limited air getting through your air intake intake manifold tuning (imt) valve position sensor / switch bank 1, circuit low also exhaust turbocharger control module 1 (j724), voltage supply outside permissible range will delay your vw fault. |
18421 Possible Causes:
18421 vw fault code may be caused by one or more of the following:
- Turbocharger Boost Sensor A Circuit Low
- Clutch Position Sensor Circuit Malfunction
- Crankshaft Position Sensor A Circuit Malfunction
- Glow Plug/Heater Circuit 'A' Malfunction
- Reverse Input Circuit
- Timing Reference High Resolution Signal A Too Many Pulses
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Cylinder 1 Injector Circuit Low
What To Check After Fixing 18421 Code
- Inspect all the connections ignition coil 'j' primary control, circuit low
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns