- Faulty Oxygen Sensor: The oxygen sensor monitors the amount of oxygen in the exhaust gas and helps the engine control unit (ECU) adjust the air-fuel mixture accordingly.
- Faulty Catalytic Converter: The catalytic converter helps convert harmful pollutants in the exhaust gas into less harmful substances.
- Faulty fuel injector: A faulty fuel injector can cause an insufficient amount of fuel to be delivered to the engine, leading to a lean air-fuel mixture and triggering the check engine light.
- Faulty Spark Plugs: Worn-out or faulty spark plugs can result in incomplete combustion, causing emissions control issues and illuminating the check engine light.
- Vacuum Leaks: Excessive vacuum leaks can also affect the air-fuel mixture and lead to check engine light issues.
- Wiring problems: An open or shorted circuit in the engine control system wiring (including oxygen sensor wiring) can confuse the ECU.
To properly diagnose the cause of the check engine light, it's advisable to seek assistance from a certified mechanic to use a diagnostic tool to retrieve trouble codes stored in the ECU, which can lead you and/or your mechanic closer to identifying the exact source of the problem
