What are the reasons for the engine fault light to illuminate?
2 Answers
The reasons for the engine fault light to illuminate are: 1. Poor gasoline quality leading to incomplete combustion in the cylinder and carbon deposits; 2. Carbon deposits in the intake tract and piston top, causing poor atomization and incomplete combustion; 3. Excessive engine mileage, weakening the spark plug's working characteristics; 4. Faulty ignition coil causing poor ignition and incomplete combustion; 5. Advanced vehicle age and mechanical aging, leading to poor engine conditions and incomplete combustion; 6. Faults in certain sensors or the computer board. The methods to address the engine fault light are: 1. Replace with higher-grade gasoline; 2. Replace the oxygen sensor; 3. Replace the air flow sensor; 4. Clean the spark plugs; 5. Replace the engine; 6. Replace the water temperature sensor.
An illuminated engine warning light is no small matter. Having driven for over a decade, I've encountered this issue several times and can share some insights. The most common causes include faulty sensors, such as oxygen sensors that malfunction during emissions monitoring, or aging throttle position sensors that provide inaccurate data, triggering the light. Once, my warning light came on because the fuel cap wasn't tightened properly, allowing air to leak in and causing a false system alert—an easy fix. Issues in the ignition system, like worn spark plugs or faulty ignition coils, can also cause the light to illuminate due to poor ignition. Exhaust problems, such as a clogged catalytic converter affecting tailpipe emissions treatment, will similarly trigger the light. Don’t overlook poor fuel quality or low fuel levels, as these can sometimes be related. When the light comes on, stay calm—start with simple checks before heading to a repair shop for diagnostics. Delaying repairs risks engine damage and higher costs. Regular maintenance, like timely oil and filter changes, can prevent these issues.
