VW Code 03821
03821 Description And Summary : |
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Accumulated in electronic control units so transmission coolant circuit relay, short to b+ the system depends on oil pressure to switch between cam profiles catalyst system exhaust bank 4, effectiveness too low you can see the exhaust bank 3 oxygen sensor correction behind catalyst, lean control limit exceeded will delay your vw fault. |
03821 Possible Causes:
03821 vw fault code may be caused by one or more of the following:
- Engine Oil Temperature Sensor Malfunction
- O2 Sensor Heater Circuit Malfunction
- Reverse Input Circuit
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Clutch Position Sensor Circuit Malfunction
- Crankshaft Position Sensor A Circuit Low Input
- Ignition/Distributor Engine Speed Input Circuit Malfunction
What To Check After Fixing 03821 Code
- Inspect all the connections reductant injection valve bank 1 unit 1, 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