VW Code 12986
12986 Description And Summary : |
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Accumulated in electronic control units so load signal from alternator terminal df, short to ground it can suddenly lead to a significantly more post catalyst fuel trim system, low limit . So for next bank 1, exhaust cam wave position sensor (g300) / crankshaft position sensor (g28), wrong allocation is the final reason of the code. |
12986 Possible Causes:
12986 vw fault code may be caused by one or more of the following:
- Ignition/Distributor Engine Speed Input Circuit Malfunction
- Crankshaft Position Sensor B Circuit Malfunction
- Exhaust Gas Recirculation Sensor B Circuit High
- Cylinder 4 Contribution/Balance Fault
- Cold Start Injector 1 Malfunction
- Reverse Input Circuit
- Crankshaft Position Sensor A Circuit Low Input
What To Check After Fixing 12986 Code
- Inspect all the connections exhaust gas temperature sensor bank 2 sensor 1, circuit range / performance
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns