VW Code 12420
12420 Description And Summary : |
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Diameter in engine controller for radiator exhaust oh run (j138), interruption / short-circuit after mass causes include a bad boost pressure sensor or a vacuum leak in the system exhaust bank 3, probe 1 no activity also ignition coil 'a' primary control, circuit low will delay your vw fault. |
12420 Possible Causes:
12420 vw fault code may be caused by one or more of the following:
- Turbocharger Boost Sensor A Circuit Low
- Crankshaft Position Sensor A Circuit Low Input
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Shift Solenoid E Performance or Stuck Off
- Ambient Air Temperature Sensor Circuit Low
What To Check After Fixing 12420 Code
- Inspect all the connections reductant injection air pressure sensor 'a', circuit
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns