What are the reasons why the engine fault light stays on and cannot be turned off?
1 Answers
The reason why the engine fault light stays on may be due to poor gasoline quality, leading to incomplete combustion of the air-fuel mixture in the cylinder, which triggers the pollution light. Reasons for the engine light to come on: Carbon deposits in the intake tract and on the piston top can cause poor atomization, leading to incomplete combustion and triggering the pollution light. During cold starts, especially when the temperature drops sharply, the pollution light may come on due to the computer's temperature correction issue. However, once the temperature stabilizes at a certain level, the light will usually stabilize. If the engine has been driven for a long mileage, weakened spark plug performance can cause the pollution light to illuminate. Excessive carbon deposits can make ignition difficult, leading to reverse breakdown of the ignition coil, resulting in ignition failure and incomplete combustion, which triggers the pollution light. A distinct characteristic of this issue is severe and persistent engine shaking when the ignition coil fails. If the shaking is not persistent, the ignition coil can usually be ruled out. Solutions for when the engine fault light comes on: Use fuel additives to clean the entire fuel system. After cleaning the engine, switch to a higher-grade gasoline. Use high-quality fuel additives to improve the cleanliness level of the fuel. Replace the catalytic converter.
