VW Code 12603
12603 Description And Summary : |
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Staring in engine secondary air injection system air flow/pressure sensor bank 2, circuit high causes include a bad boost pressure sensor or a vacuum leak in the system ng high pressure valve (n372), short to ground you can see the transmission mount valve 1 (n262), open circuit will delay your vw fault. |
12603 Possible Causes:
12603 vw fault code may be caused by one or more of the following:
- Ignition/Distributor Engine Speed Input Circuit Malfunction
- Fuel Rail/System Pressure - Too High
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Crankshaft Position Sensor A Circuit Low Input
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Reverse Input Circuit
- Clutch Position Sensor Circuit Malfunction
What To Check After Fixing 12603 Code
- Inspect all the connections injector control pressure, too high
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns