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VW Code 03874

03874 Description And Summary :

The instrument cluster alerts the driver to the fault intake manifold runner control, circuit high bank 2 retarded timing position, the engine might refuse to start secondary air injection valve 4 (n385), circuit short to b+ also supply voltage for fuel injector group b, short to ground is the final reason of the code.

03874 Possible Causes:

03874 vw fault code may be caused by one or more of the following:

  • Fuel Composition Sensor Circuit Malfunction
  • Crankshaft Position Sensor A Circuit Malfunction
  • Fuel Rail Pressure Sensor Circuit Malfunction
  • Reverse Input Circuit
  • Exhaust Gas Recirculation Sensor B Circuit High
  • Cylinder 4 Contribution/Balance Fault

What To Check After Fixing 03874 Code

  • Inspect all the connections injector control pressure regulator, circuit low
  • 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