What Causes the Engine Fault Indicator Light to Illuminate?
2 Answers
The reasons for the engine fault indicator light illuminating are as follows: 1. Poor gasoline quality: This can lead to incomplete combustion of the air-fuel mixture in the cylinders, causing the pollution light to illuminate, and it also easily leads to carbon buildup. 2. Carbon buildup issues: The presence of carbon deposits in the intake tract and on the piston tops can result in poor atomization, leading to incomplete combustion and the illumination of the pollution light. 3. Unstable temperature: During cold starts, especially when the outside temperature drops sharply, the computer's temperature correction may cause the pollution light to illuminate at startup. However, once the temperature stabilizes at a certain level without fluctuations, the situation will become relatively stable.
I've been driving for over twenty years and have seen several common reasons for the engine warning light to come on. Sensor issues are the most frequent, such as carbon buildup on the oxygen sensor or a loose position sensor, which can cause inaccurate exhaust data readings and trigger the light. Poor fuel quality can also activate the warning light, especially if the gasoline contains impurities or is of a lower grade. Additionally, aging spark plugs, damaged ignition coils leading to poor combustion, or a dirty throttle body affecting air intake can all cause the light to come on. Another possibility is loose wiring connections, which can prevent the engine computer from reading data and trigger a warning. My advice is not to panic when the light comes on—check if the fuel cap is tightened, try turning the engine off and restarting, and if the light remains on, read the fault codes for diagnosis as soon as possible.
