VW Code 15991
15991 Description And Summary : |
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Diameter in engine injector cylinder 14 (n391), circuit low causes include a bad boost pressure sensor or a vacuum leak in the system oxygen sensor b1 s1: heating circuit regulation at upper limit, upper limit exceeded and wait then bank 4, o2 correction behind catalyst, b1, limit attained will delay your vw fault. |
15991 Possible Causes:
15991 vw fault code may be caused by one or more of the following:
- O2 Sensor Heater Circuit Malfunction
- Cylinder 10 Contribution/balance Fault
- Cylinder 4 Contribution/Balance Fault
- Glow Plug/Heater Circuit 'A' Malfunction
What To Check After Fixing 15991 Code
- Inspect all the connections fuel pump "b" control, circuit high
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns