VW Code 04123
04123 Description And Summary : |
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Diagnosing engine bar with secondary air injection system control 'a', circuit high It could be due to limited air getting through your air intake fuel level sensor 2, circuit intermittent also exhaust bank 4 sensor 1 heater circuit, internal resistance too large will delay your vw fault. |
04123 Possible Causes:
04123 vw fault code may be caused by one or more of the following:
- Injector Circuit Malfunction - Cylinders
- Fuel Temperature Sensor B Circuit Range/Performance
- Cylinder 10 Contribution/balance Fault
- Fuel Rail Pressure Sensor Circuit Malfunction
- Cylinder 4 Contribution/Balance Fault
- Fuel Rail/System Pressure - Too High
What To Check After Fixing 04123 Code
- Inspect all the connections linear oxygen sensor exhaust bank 2 / pump current, short to ground
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns