2. Spark plug issues. The spark plugs ignite the air-fuel mixture in the engine. If the spark plugs are worn out, damaged, or fouled, it can cause the check engine light to come on.
3. Catalytic converter issues. The catalytic converter helps to remove harmful pollutants from the exhaust gas. When the catalytic converter is damaged or inefficient, it can cause the check engine light to come on.
4. Evaporative emissions system issues. The evaporative emissions system prevents fuel vapors from escaping from the fuel tank and fuel system. When the evaporative emissions system is not working properly, it can cause the check engine light to come on.
5. Fuel injector issues. The fuel injectors spray fuel into the engine cylinders. If the fuel injectors are clogged, dirty, or damaged, it can cause the check engine light to come on.
6. Mass air flow sensor issues. The mass air flow sensor measures the amount of air flowing into the engine. When the mass air flow sensor is faulty, it can cause the check engine light to come on.
7. Throttle position sensor issues. The throttle position sensor monitors the position of the throttle and helps the engine control the air-fuel mixture. When the throttle position sensor is faulty, it can cause the check engine light to come on.
8. Coolant temperature sensor issues. The coolant temperature sensor measures the temperature of the engine coolant. When the coolant temperature sensor is faulty, it can cause the check engine light to come on.
9. Oxygen sensor heater issues. The oxygen sensor heater helps to heat up the oxygen sensor so that it can function properly. When the oxygen sensor heater is faulty, it can cause the check engine light to come on.
10. Electrical problems. A variety of electrical problems can also cause the check engine light to come on, such as a faulty ignition coil, a loose wire, or a bad ground connection.
