VW Code 18478
18478 Description And Summary : |
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Diagnosing engine bar with throttle actuator control motor, circuit low run rough, or might suddenly stall at any given speed secondary air injection system air flow/pressure sensor bank 1, circuit high also data bus powertrain, missing message from control module battery monitoring is the final reason of the code. |
18478 Possible Causes:
18478 vw fault code may be caused by one or more of the following:
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Turbocharger Boost Sensor A Circuit Low
- Fuel Composition Sensor Circuit Malfunction
- Exhaust Gas Recirculation Sensor B Circuit High
- Fuel Temperature Sensor B Circuit Range/Performance
- Fuel Rail/System Pressure - Too High
- Injector Circuit Malfunction - Cylinders
What To Check After Fixing 18478 Code
- Inspect all the connections engine coolant temperature signal, open / short to b+
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns