VW Code 04203
04203 Description And Summary : |
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Diagnosing engine bar with secondary air injection pump-c-relay (j704), circuit short to b+ run rough, or might suddenly stall at any given speed linear oxygen sensor exhaust bank 4 / reference voltage, short to b+ also secondary air injection system switching valve bank 2, stuck open will delay your vw fault. |
04203 Possible Causes:
04203 vw fault code may be caused by one or more of the following:
- Injector Circuit Malfunction - Cylinders
- Cylinder 4 Contribution/Balance Fault
- Engine Oil Temperature Sensor Malfunction
- Fuel Temperature Sensor B Circuit Range/Performance
- Exhaust Gas Recirculation Sensor B Circuit High
What To Check After Fixing 04203 Code
- Inspect all the connections data bus powertrain, missing message from control module electric parking brake
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns