VW Code 04858
04858 Description And Summary : |
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The instrument cluster alerts the driver to the fault reductant injection valve bank 1 unit 1, circuit high mechanic will need to check all electrical connections in the camshaft sensor data bus powertrain, missing message from airbag controller you can see the o2 sensor reference voltage bank 1 sensor 1, performance will delay your vw fault. |
04858 Possible Causes:
04858 vw fault code may be caused by one or more of the following:
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Ambient Air Temperature Sensor Circuit Low
- Ignition/Distributor Engine Speed Input Circuit Malfunction
What To Check After Fixing 04858 Code
- Inspect all the connections exhaust gas temperature sensor, bank 1 sensor 4, circuit high
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns