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Why is the engine malfunction indicator light on but no trouble code present?

1Answers

AnthonyFitz

09/04/2025, 11:10:04 PM

If the engine malfunction indicator light comes on and then goes off, it is often due to substandard fuel quality leading to incomplete combustion of the air-fuel mixture in the engine. Here is additional information: 1. Add high-quality fuel additives: In such cases, after refueling, adding some high-quality fuel additives or choosing gas stations with better fuel quality can help improve fuel quality. 2. The exhaust emission light remains on continuously: In this situation, diagnostic equipment is needed to identify fault codes stored in the engine. Based on the fault codes and the data status of systems like the oxygen sensor, further troubleshooting can be conducted. 3. Causes: Any issues with components related to the air-fuel mixture combustion in the engine can trigger the exhaust emission warning light. The most common causes include: dirty throttle body (recommended cleaning every 20,000 to 30,000 kilometers); carbon buildup on valves and fuel injectors (recommended cleaning the intake and fuel system every 30,000 to 40,000 kilometers). Additionally, the engine must be maintained strictly according to the manufacturer's schedule, including regular replacement of engine oil, oil filter, air filter, and fuel filter.

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