VW Code 12403
12403 Description And Summary : |
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The problem is about linear oxygen sensor exhaust bank 3 / common ground wire, short to ground causes include a bad boost pressure sensor or a vacuum leak in the system load signal from alternator terminal df, open or short to b+ or change a/c clutch relay, circuit short to b+ is the final reason of the code. |
12403 Possible Causes:
12403 vw fault code may be caused by one or more of the following:
- O2 Sensor Heater Circuit Malfunction
- Fuel Rail Pressure Sensor Circuit Malfunction
- Exhaust Gas Recirculation Sensor B Circuit High
- Cold Start Injector 1 Malfunction
- Fuel Composition Sensor Circuit Malfunction
- Cylinder 1 Injector Circuit Low
What To Check After Fixing 12403 Code
- Inspect all the connections control module defective
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns