What Causes the Engine Malfunction Light to Illuminate and the Car to Fail to Start?

1 Answers
VonJune
07/29/25 2:55pm
Here are the specific reasons why the engine malfunction light illuminates and the car fails to start: Excessive Carbon Buildup: Too much carbon buildup in the throttle body or inside the engine can cause the engine malfunction light to illuminate and prevent the car from starting. The engine carbon buildup needs to be cleaned. Oxygen Sensor Malfunction: A faulty oxygen sensor can lead to an imbalance in the air-fuel mixture. This issue is common if the car is frequently driven at low speeds in urban areas. The oxygen sensor needs to be replaced. Fuel Injector Issues: If the fuel injector is leaking, it may continue to supply fuel even after the accelerator pedal is released, resulting in an overly rich mixture at low speeds. This can cause unstable idle after releasing the throttle and, in severe cases, may lead to the engine stalling. The fuel injector needs to be replaced.
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