1. Oxygen Sensor: The oxygen sensor measures the amount of oxygen in the exhaust gas and helps the engine maintain the proper air-fuel mixture. A faulty oxygen sensor can cause the check engine light to come on.
2. Spark Plugs: Worn-out spark plugs can cause the engine to misfire, which can trigger the check engine light.
3. Catalytic Converter: The catalytic converter helps to reduce emissions by converting harmful pollutants into less harmful substances. A faulty catalytic converter can cause the check engine light to come on.
4. Mass Air Flow Sensor: The mass air flow sensor measures the amount of air entering the engine. A faulty mass air flow sensor can cause the engine to run rich or lean, which can trigger the check engine light.
5. Fuel Injector: A faulty fuel injector can cause the engine to run rough or misfire, which can trigger the check engine light.
6. EVAP System: The EVAP system helps to prevent fuel vapors from escaping into the atmosphere. A faulty EVAP system can cause the check engine light to come on.
7. PCV Valve: The PCV valve helps to regulate the pressure in the engine's crankcase. A faulty PCV valve can cause the check engine light to come on.
