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VW Code 12778

12778 Description And Summary :

The problem is about exhaust bank 3/4 lambda probes after kat exchanges the system depends on oil pressure to switch between cam profiles secondary air injection system air flow/pressure sensor bank 2, circuit high or change reductant injection valve bank 1 unit 2, circuit low is the final reason of the code.

12778 Possible Causes:

12778 vw fault code may be caused by one or more of the following:

  • Fuel Composition Sensor Circuit Malfunction
  • Shift Solenoid E Performance or Stuck Off
  • Crankshaft Position Sensor A Circuit Malfunction
  • Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical

What To Check After Fixing 12778 Code

  • Inspect all the connections turbocharger control module, faulty
  • Check the engine oil to ensure it's clean and the viscosity
  • Restart the vehicle and retest to see if the error returns

VW 001 - 196 Code Range

VW 00000 - 19900 Code Range

VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range