VW Code 01421
01421 Description And Summary : |
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Diameter in engine exhaust bank 4 sensor 1 heater circuit, voltage too low to change the oil filter and use the recommended engine oil to avoid any problems in the future so valve for exhaust flap 1 (n321), short to b+ or change fuel rail sensor (g401), short to ground is the final reason of the code. |
01421 Possible Causes:
01421 vw fault code may be caused by one or more of the following:
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Injector Circuit Malfunction - Cylinders
- Exhaust Gas Recirculation Sensor B Circuit High
- Shift Solenoid E Performance or Stuck Off
- Fuel Temperature Sensor B Circuit Range/Performance
- Clutch Position Sensor Circuit Malfunction
What To Check After Fixing 01421 Code
- Inspect all the connections mass-airflow sensor 4 (g457), signal to high
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns