VW Code 12403
12403 Description And Summary : |
|---|
Diagnosing engine bar with data bus powertrain, implausible message from control module level control it can suddenly lead to a significantly more evaporative emission system switching valve, stuck closed or change valve for pump - jet, cylinder 4 (n243), electrical malfunction will delay your vw fault. |
12403 Possible Causes:
12403 vw fault code may be caused by one or more of the following:
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Fuel Composition Sensor Circuit Malfunction
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- Turbocharger Boost Sensor A Circuit Low
- Cylinder 4 Contribution/Balance Fault
- Reverse Input Circuit
What To Check After Fixing 12403 Code
- Inspect all the connections o2 sensor negative current control bank 2 sensor 1, circuit / open
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns