VW Code 04904
04904 Description And Summary : |
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Diagnosing engine bar with oxygen (lambda) sensor b1 s1, heater return coupling causes include a bad boost pressure sensor or a vacuum leak in the system linear oxygen sensor exhaust bank 4 / reference voltage, open circuit you can see the injection pump timing offset will delay your vw fault. |
04904 Possible Causes:
04904 vw fault code may be caused by one or more of the following:
- Turbocharger Boost Sensor A Circuit Low
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Reverse Input Circuit
- Fuel Composition Sensor Circuit Malfunction
What To Check After Fixing 04904 Code
- Inspect all the connections exhaust bank 3 sensor 1 oxygen sensor signal, voltage too low during deceleration
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns