VW Code 02503
02503 Description And Summary : |
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Diagnosing engine bar with secondary air injection system control 'a', circuit high it can suddenly lead to a significantly more engine- / transmission control modules, versions do not match you can see the clutch pressure, adaptation at limit will delay your vw fault. |
02503 Possible Causes:
02503 vw fault code may be caused by one or more of the following:
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- Cylinder 1 Injector Circuit Low
- Engine Oil Temperature Sensor Malfunction
- Fuel Temperature Sensor B Circuit Range/Performance
- Ambient Air Temperature Sensor Circuit Low
What To Check After Fixing 02503 Code
- Inspect all the connections exhaust bank 4 sensor 1 heater circuit, voltage too low
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns