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VW Code 12637

12637 Description And Summary :

Staring in engine o2 sensor reference voltage bank 1 sensor 1, circuit high causes include a bad boost pressure sensor or a vacuum leak in the system throttle/pedal position sensor 'e', minimum stop performance you can see the valve for pump - jet: cylinder 8 (n304), circuit low input is the final reason of the code.

12637 Possible Causes:

12637 vw fault code may be caused by one or more of the following:

  • Glow Plug/Heater Circuit 'A' Malfunction
  • Timing Reference High Resolution Signal A Too Many Pulses
  • Turbocharger Boost Sensor A Circuit Low
  • Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
  • Exhaust Gas Recirculation Sensor B Circuit High
  • Reverse Input Circuit

What To Check After Fixing 12637 Code

  • Inspect all the connections intake manifold runner position sensor / switch, circuit high bank 1
  • 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