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VW Code 03748

03748 Description And Summary :

The instrument cluster alerts the driver to the fault relays for coolant additive pump (j496), short to ground it can suddenly lead to a significantly more o2 sensor signal bank 2 sensor 2, biased / stuck rich or crankshaft position signal output, circuit low is the final reason of the code.

03748 Possible Causes:

03748 vw fault code may be caused by one or more of the following:

  • Ambient Air Temperature Sensor Circuit Low
  • Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
  • O2 Sensor Heater Circuit Malfunction
  • Timing Reference High Resolution Signal A Too Many Pulses
  • Exhaust Gas Recirculation Sensor B Circuit High
  • Fuel Rail Pressure Sensor Circuit Malfunction

What To Check After Fixing 03748 Code

  • Inspect all the connections exhaust gas recirculation system performance
  • 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