- Faulty Oxygen Sensor: Monitors the oxygen content in the exhaust. A faulty sensor can provide incorrect readings, leading to an inaccurate air-fuel ratio and triggering the check engine light.
- Emission Control System Issues: Malfunctions in components like the catalytic converter or evaporative emissions control system can also trigger the service engine light.
- Fuel System Problems: Issues with fuel delivery, such as a clogged fuel filter or a faulty fuel injector, can cause the engine to run lean or rich, leading to the check engine light.
- Spark Plug or Ignition Coil Issues: Worn-out spark plugs or a faulty ignition coil can disrupt the engine's combustion process and cause the service engine light to come on.
- Mass Air Flow (MAF) Sensor Problems: The MAF sensor measures the air entering the engine. Incorrect readings can affect the air-fuel mixture, triggering the check engine light.
- Coolant Temperature Sensor Issues: If the coolant temperature sensor malfunctions, it can provide incorrect engine temperature readings, affecting engine performance and possibly activating the service engine light.
- Faulty Throttle Position Sensor: The throttle position sensor detects the throttle valve position. Incorrect readings can disrupt engine performance and cause the check engine light to come on.
- Vacuum Leak: A vacuum leak can interfere with the proper functioning of the engine, leading to the service engine light.
Note: The specific cause for your vehicle's service engine light can be determined by using a diagnostic tool to read the trouble codes stored in the vehicle's computer. Consult a mechanic or use an OBD-II scanner to identify the exact issue and address it appropriately.
