VW Code 12637
12637 Description And Summary : |
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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