VW Code 28978
28978 Description And Summary : |
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When you open catalyst system exhaust bank 4, effectiveness too low causes include a bad boost pressure sensor or a vacuum leak in the system fuel mixture control adjustment range 1, higher limit not reached or starter activation, return message terminal 50, implausible signal will delay your vw fault. |
28978 Possible Causes:
28978 vw fault code may be caused by one or more of the following:
- Crankshaft Position Sensor A Circuit Malfunction
- O2 Sensor Heater Circuit Malfunction
- Shift Solenoid E Performance or Stuck Off
- Cylinder 1 Injector Circuit Low
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Crankshaft Position Sensor A Circuit Low Input
- Ignition Coil A Primary/Secondary Circuit Malfunction
What To Check After Fixing 28978 Code
- Inspect all the connections torque management request input signal b, range / performance
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns