- Oxygen sensor: The oxygen sensor monitors the amount of oxygen in the exhaust gas and helps the engine adjust the fuel mixture accordingly. If the oxygen sensor is faulty, it can cause the engine to run rich or lean, which can lead to a number of problems, including increased emissions and decreased fuel economy.
- Catalytic converter: The catalytic converter is a device that helps to reduce emissions by converting harmful pollutants into less harmful substances. If the catalytic converter is damaged or clogged, it can cause the check engine light to come on.
- Spark plugs: Spark plugs provide the spark that ignites the fuel in the engine. If the spark plugs are worn out or damaged, it can cause the engine to misfire, which can lead to a number of problems, including decreased performance and increased emissions.
- Fuel injector: Fuel injectors deliver fuel to the engine. If the fuel injectors are clogged or damaged, it can cause the engine to run rich or lean, which can lead to a number of problems, including increased emissions and decreased fuel economy.
- Mass air flow sensor: The mass air flow sensor measures the amount of air that flows into the engine. If the mass air flow sensor is faulty, it can cause the engine to run rich or lean, which can lead to a number of problems, including increased emissions and decreased fuel economy.
It's important to note that the check engine light can come on for a variety of reasons, and the only way to know for sure what the problem is to have the vehicle diagnosed by a qualified mechanic.
