VW Code 12678
12678 Description And Summary : |
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Diameter in engine reductant injection air pressure sensor 'a', circuit It could be due to limited air getting through your air intake clutch pressure, adaptation at limit . On the other hand injector cylinder 14 (n391), circuit high will delay your vw fault. |
12678 Possible Causes:
12678 vw fault code may be caused by one or more of the following:
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- O2 Sensor Heater Circuit Malfunction
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Engine Shutoff Solenoid Malfunction
- Timing Reference High Resolution Signal A Too Many Pulses
- Cold Start Injector 1 Malfunction
- Injector Circuit Malfunction - Cylinders
- Glow Plug/Heater Circuit 'A' Malfunction
What To Check After Fixing 12678 Code
- Inspect all the connections exhaust bank 3, probe 2 no activity
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns