VW Code 12977
12977 Description And Summary : |
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This something to do with the intake camshaft timing planetary overdrive / low range, mechanical malfunction causes include a bad boost pressure sensor or a vacuum leak in the system nox sensor heater sense bank 1, circuit . So for next o2 sensor signal bank 1 sensor 3, biased / stuck lean will delay your vw fault. |
12977 Possible Causes:
12977 vw fault code may be caused by one or more of the following:
- O2 Sensor Heater Circuit Malfunction
- Glow Plug/Heater Circuit 'A' Malfunction
- Cold Start Injector 1 Malfunction
- Injector Circuit Malfunction - Cylinders
- Timing Reference High Resolution Signal A Too Many Pulses
- Fuel Temperature Sensor B Circuit Range/Performance
- Turbocharger Boost Sensor A Circuit Low
What To Check After Fixing 12977 Code
- Inspect all the connections fuel mixture control adjustment range 2, higher limit not reached
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns