Oxygen Sensor: The oxygen sensors monitor the oxygen content in the exhaust gas to help ensure efficient fuel combustion. A malfunctioning oxygen sensor can affect fuel efficiency and cause the check engine light to illuminate.
Catalytic Converter: The catalytic converter helps clean the exhaust emissions by converting harmful pollutants into less harmful gases. A faulty catalytic converter can cause the check engine light to turn on.
Evaporative Emission System (EVAP) Issues: The EVAP system prevents fuel vapor from escaping into the atmosphere. A leak or malfunction in the EVAP system can trigger the check engine light.
Mass Air Flow (MAF) Sensor: The MAF sensor measures the amount of air entering the engine. An incorrect air/fuel mixture due to a faulty MAF sensor can cause engine performance issues and illuminate the check engine light.
Ignition System Problems: Issues such as worn spark plugs, faulty ignition coils, or problems with the spark plug wires can cause misfires and lead to the check engine light coming on.
Engine Coolant Temperature Sensor: This sensor monitors the engine's temperature and helps control the engine's cooling system. A malfunctioning sensor can provide incorrect temperature readings and trigger the check engine light.
Fuel Injector Problems: Malfunctioning fuel injectors can affect fuel delivery, causing engine performance issues and illuminating the check engine light.
Vacuum Leaks: Vacuum leaks can cause the engine to run inefficiently and can trigger the check engine light.
Exhaust Gas Recirculation (EGR) System: The EGR system reduces nitrogen oxide (NOx) emissions by recirculating a portion of the exhaust gas back into the engine. Problems with the EGR system can cause the check engine light to come on.
It's important to note that the check engine light can be triggered by various issues, so it's recommended to have the vehicle scanned for fault codes by a qualified mechanic or automotive technician to determine the specific cause of the illuminated check engine light.
