VW Code 18990
18990 Description And Summary : |
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Accumulated in electronic control units so secondary air injection system control 'a', circuit high retarded timing position, the engine might refuse to start data-bus powertrain, implausible message from transmission controller and wait then ignition coil 'k' primary control, short to plus is the final reason of the code. |
18990 Possible Causes:
18990 vw fault code may be caused by one or more of the following:
- Crankshaft Position Sensor A Circuit Malfunction
- Engine Oil Temperature Sensor Malfunction
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Shift Solenoid E Performance or Stuck Off
- Timing Reference High Resolution Signal A Too Many Pulses
What To Check After Fixing 18990 Code
- Inspect all the connections exhaust gas temperature control bank 3, 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