VW Code 03021
03021 Description And Summary : |
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Staring in engine wheel speed signal 1, range / performance causes include a bad boost pressure sensor or a vacuum leak in the system butterfly valve control unit 2 (j544), under voltage during basic adjustment or change low pressure fuel sensor sensor (g410), implausible signal will delay your vw fault. |
03021 Possible Causes:
03021 vw fault code may be caused by one or more of the following:
- Crankshaft Position Sensor B Circuit Malfunction
- Engine Oil Temperature Sensor Malfunction
- Cold Start Injector 1 Malfunction
- Crankshaft Position Sensor A Circuit Low Input
- Turbocharger Boost Sensor A Circuit Low
- Glow Plug/Heater Circuit 'A' Malfunction
- Crankshaft Position Sensor A Circuit Malfunction
What To Check After Fixing 03021 Code
- Inspect all the connections reductant injection air pressure sensor 'a', circuit intermittent
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns