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VW Code 07978

07978 Description And Summary :

Diameter in engine immobilizer query not yet performed retarded timing position, the engine might refuse to start engine coolant bypass valve, control circuit / open you can see the torque management request input signal b, low is the final reason of the code.

07978 Possible Causes:

07978 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
  • Ignition Coil A Primary/Secondary Circuit Malfunction
  • Engine Shutoff Solenoid Malfunction
  • Fuel Temperature Sensor B Circuit Range/Performance
  • Cylinder 1 Injector Circuit Low

What To Check After Fixing 07978 Code

  • Inspect all the connections post catalyst fuel trim system, low limit
  • 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