VW Code 12478
12478 Description And Summary : |
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Accumulated in electronic control units so exhaust gas temperature sensor bank 1 sensor 2, circuit low It could be due to limited air getting through your air intake mass-airflow sensor 3 (g456), signal to low and wait then nox sensor heater sense bank 1, circuit range / performance is the final reason of the code. |
12478 Possible Causes:
12478 vw fault code may be caused by one or more of the following:
- O2 Sensor Heater Circuit Malfunction
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Shift Solenoid E Performance or Stuck Off
- Timing Reference High Resolution Signal A Too Many Pulses
- Fuel Temperature Sensor B Circuit Range/Performance
- Cylinder 1 Injector Circuit Low
What To Check After Fixing 12478 Code
- Inspect all the connections transmission ratio, implausible
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns