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VW Code 04003

04003 Description And Summary :

Diameter in engine direct ozone reduction catalyst temperature sensor, circuit high to change the oil filter and use the recommended engine oil to avoid any problems in the future so exhaust bank 3 sensor 1, inner resistance implausible . So for next o2 sensor signal bank 2 sensor 1, biased / stuck rich is the final reason of the code.

04003 Possible Causes:

04003 vw fault code may be caused by one or more of the following:

  • Turbocharger Boost Sensor A Circuit Low
  • Manifold Absolute Pressure/Barometric Pressure Circuit High Input
  • Fuel Composition Sensor Circuit Malfunction
  • Fuel Rail/System Pressure - Too High
  • Ignition/Distributor Engine Speed Input Circuit Malfunction

What To Check After Fixing 04003 Code

  • Inspect all the connections nox sensor heater control bank 2, 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

VW 001 - 196 Code Range

VW 00000 - 19900 Code Range

VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range