OBDII Automotive Articles - 5 Most Common Reasons for a Check Engine Light

5 Most Common Reasons for a Check Engine Light

The Check Engine Light or Service Engine Soon Warning Light is one of the most frustrating and confusing warnings for vehicle owners.

A steady warning light means there is no immediate cause for alarm, but you should still get it checked out. Flashing warning light means that the problem is more serious, and you must check for codes.

Common causes vary depending on your vehicle’s brand, but here is a list in general of the most common:

1. Loose or damaged gas cap



2. Worn out or faulty spark plugs



3. Faulty Oxygen (O2) Sensor



4. Faulty Mass Air Flow (MAF) Sensor



5. Faulty Camshaft Position Sensor