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What are the causes of the engine fault light coming on?

2 Answers

Blakely

07/30/25 1:12am

The causes of the engine fault light coming on are: 1. Sensor damage, poor contact, or signal interruption; 2. Poor engine maintenance; 3. Poor quality fuel and engine oil; 4. Incomplete combustion of the air-fuel mixture; 5. Faulty spark plugs or ignition coils; 6. Fuel pump failure or clogged fuel lines; 7. Clogged air filter. The solutions for the engine fault light coming on are: 1. Use fuel additives to clean the entire fuel system; 2. After cleaning the engine, use higher-grade gasoline; 3. Use high-quality fuel additives to improve fuel cleanliness; 4. Replace the catalytic converter.

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OKennedy

10/20/25 5:50am

When the engine malfunction indicator light suddenly illuminates, it typically indicates that the vehicle's onboard computer has detected abnormal operation. Common causes include a faulty oxygen sensor, which is responsible for monitoring emission levels—if aged, it may mislead the air-fuel mixture control; worn spark plugs leading to ignition failure, especially noticeable during cold starts; clogged or malfunctioning fuel injection systems affecting fuel supply; a defective mass airflow sensor disrupting intake air calculation; and exhaust system issues such as a clogged catalytic converter causing abnormal pressure. Additionally, software errors or hardware failures in the engine control unit can also trigger the light. Do not overlook these issues, as prolonged neglect can increase fuel consumption, reduce power output, and even cause engine damage. I recommend using an OBD scanner to retrieve diagnostic trouble codes and identify the root cause as soon as the light appears, then promptly visit a professional repair shop to maintain vehicle health. Regular maintenance checks can reduce the likelihood of these faults occurring.

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