What are the reasons for the car's emission warning light to illuminate?

1 Answers
Roland
07/29/25 12:21pm
Car emission warning light illuminates due to: 1. Unburned or insufficiently burned fuel; 2. Poor quality fuel; 3. Severe carbon deposits on piston tops; 4. Faulty oxygen sensor or wiring issues. Solutions for engine warning light illumination include: 1. Promptly inspect the engine condition; 2. Check sensors (air flow sensor, spark plugs); 3. Verify engine knocking presence. Causes of engine warning light activation are: 1. Low-grade gasoline causing incomplete combustion and carbon buildup; 2. Worn spark plugs from extended mileage; 3. Mechanical aging of vehicle components; 4. Damaged/malfunctioning sensors (coolant temperature, crankshaft position, air flow, intake temperature, oxygen sensors) or signal interruptions.
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