Spark Knock
- Check Intake Manifold Pressure (IMP) sensor (Except Forester).
- Check Intake Air Temperature (IAT) sensor (Except Forester).
- Check intake air temperature and pressure sensor.
- Check Engine Coolant Temperature (ECT) sensor.
- Check Knock Sensor (KS).
- Check fuel injection components; fuel injectors, fuel pressure regulator and fuel filter.
- Check fuel pump and fuel pump relay.