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1. A poor combustion condition of the engine is the main reasonon for which the engine trouble light comes on.
2. Improper combustion of the mixture will cause carbon deposits or knocking in the engine. After being detected by the oxygen sensor and reported to the ECU, the fault light will illuminate as a warning. Spark plug failure, ignition coil failure, fuel pump failure, oil circuit blockage, etc. can lead to poor combustion of the engine mixture.