Possible fault causes
- Leak in exhaust system (engine → oxygen sensor upstream of catalytic converter)
- Exhaust system constricted/blocked
- Fuel injector faulty (mechanical fault)
- Timing set incorrectly
- Fault in areas: fuel high pressure, intake manifold pressure sensor, throttle valve adjusting unit, ambient pressure sensor, Intake air temperature sensor, rpm sensor, valve lift control, camshaft adjustment