VW Code 13903
13903 Description And Summary : |
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The problem is about exhaust gas temperature sensor, bank 1 sensor 4, circuit low retarded timing position, the engine might refuse to start reductant injection air pump control, circuit / open also nox sensor heater sense bank 1, circuit low will delay your vw fault. |
13903 Possible Causes:
13903 vw fault code may be caused by one or more of the following:
- O2 Sensor Heater Circuit Malfunction
- Crankshaft Position Sensor A Circuit Low Input
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Cylinder 4 Contribution/Balance Fault
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Engine Shutoff Solenoid Malfunction
- Turbocharger Boost Sensor A Circuit Low
What To Check After Fixing 13903 Code
- Inspect all the connections secondary air injection system air flow/pressure sensor bank 1, circuit range / performance
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns