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What Causes Emission System Malfunction and How to Handle It?

1 Answers

LeLola

07/29/25 6:15pm

Emission malfunction light may illuminate due to the following reasons and corresponding solutions: 1. Poor fuel combustion state, unburned or incomplete fuel combustion, engine knocking, excessively high engine temperature - requires throttle valve cleaning. 2. Low-quality fuel - since engines have high fuel quality requirements, poor fuel may cause dirt accumulation inside engine cylinders, requiring carbon deposit removal. 3. Cold starts during sudden temperature drops - the emission light may illuminate due to ECU temperature calibration issues during startup, which stabilizes when temperature remains constant. 4. Carbon deposits on piston tops causing poor atomization, weakened spark plug performance, or ignition coil failure leading to poor ignition. 5. Oxygen sensor malfunction (either the sensor itself or its circuit) or control unit failure - requires oxygen sensor inspection.

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