VW Code 15603
15603 Description And Summary : |
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Accumulated in electronic control units so fuel supply heater, control circuit low run rough, or might suddenly stall at any given speed coolant degassing valve, control circuit high you can see the exhaust bank 4 sensor 1 oxygen sensor signal, voltage too low during deceleration is the final reason of the code. |
15603 Possible Causes:
15603 vw fault code may be caused by one or more of the following:
- Exhaust Gas Recirculation Sensor B Circuit High
- Fuel Composition Sensor Circuit Malfunction
- Crankshaft Position Sensor B Circuit Malfunction
- Glow Plug/Heater Circuit 'A' Malfunction
- Injector Circuit Malfunction - Cylinders
What To Check After Fixing 15603 Code
- Inspect all the connections throttle angle signal stuck off
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns