VW Code 18991
18991 Description And Summary : |
|---|
Diagnosing engine bar with fuel tank pressure (ftp) sensor (g400), short to ground it can suddenly lead to a significantly more data bus engine/engine, software condition monitoring or change exhaust bank 3, probe 2 electrical error in the electric circuit will delay your vw fault. |
18991 Possible Causes:
18991 vw fault code may be caused by one or more of the following:
- O2 Sensor Heater Circuit Malfunction
- Timing Reference High Resolution Signal A Too Many Pulses
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Exhaust Gas Recirculation Sensor B Circuit High
- Fuel Rail Pressure Sensor Circuit Malfunction
- Injector Circuit Malfunction - Cylinders
- Cylinder 4 Contribution/Balance Fault
What To Check After Fixing 18991 Code
- Inspect all the connections secondary air injection valve 3 (n384), circuit electrical malfunction
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns