VW Code 28378
28378 Description And Summary : |
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Accumulated in electronic control units so exhaust bank 4 sensor 1 heater circuit, electrical malfunction causes include a bad boost pressure sensor or a vacuum leak in the system nox sensor heater control bank 1, circuit / open you can see the transmission coolant circuit relay, short to b+ will delay your vw fault. |
28378 Possible Causes:
28378 vw fault code may be caused by one or more of the following:
- Fuel Rail/System Pressure - Too High
- Crankshaft Position Sensor A Circuit Malfunction
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Fuel Composition Sensor Circuit Malfunction
- Cylinder 4 Contribution/Balance Fault
- Ambient Air Temperature Sensor Circuit Low
- Crankshaft Position Sensor B Circuit Malfunction
What To Check After Fixing 28378 Code
- Inspect all the connections barometric pressure sensor 'a', circuit
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns