- Oxygen Sensor: The oxygen sensor monitors the amount of oxygen in the exhaust gas. If the oxygen sensor is faulty, it can cause the engine to run rich or lean, which will trigger the check engine light.
- Spark Plugs and Wires: Worn or damaged spark plugs and wires can cause misfires, which can trigger the check engine light.
- Catalytic Converter: The catalytic converter helps to reduce emissions. If the catalytic converter is damaged or clogged, it can cause the check engine light to come on.
- Mass Air Flow Sensor: The mass air flow sensor measures the amount of air entering the engine. If the mass air flow sensor is faulty, it can cause the engine to run rich or lean, which will trigger the check engine light.
- Fuel Injector: A faulty fuel injector can cause misfires, which can trigger the check engine light.
- EGR Valve: The EGR valve recirculates exhaust gas back into the engine to reduce emissions. If the EGR valve is stuck open or closed, it can cause the check engine light to come on.
- Vacuum Leak: A vacuum leak can cause the engine to run lean, which will trigger the check engine light.
- PCV Valve: The PCV valve helps to remove crankcase gases from the engine. If the PCV valve is stuck closed, it can cause pressure to build up in the crankcase, which can trigger the check engine light.
It's important to note that the check engine light can also come on for other reasons, so it's best to have it diagnosed by a qualified mechanic to determine the exact cause.
