VW Code 12520
12520 Description And Summary : |
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When you open control module defective retarded timing position, the engine might refuse to start fuel pressure regulator 2 control circuit high or change secondary air injection system air flow/pressure sensor bank 1, circuit low will delay your vw fault. |
12520 Possible Causes:
12520 vw fault code may be caused by one or more of the following:
- Cold Start Injector 1 Malfunction
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Crankshaft Position Sensor A Circuit Low Input
- Cylinder 10 Contribution/balance Fault
- Exhaust Gas Recirculation Sensor B Circuit High
- Fuel Composition Sensor Circuit Malfunction
What To Check After Fixing 12520 Code
- Inspect all the connections exhaust bank 3/4 lambda probes after kat exchanges
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns