Here's what you should do:
1. Get the diagnostic trouble codes (DTCs) read: This is the most crucial step. The SES light is triggered by one or more DTCs stored in the car's computer. You have several options:
* OBD-II Scanner: Buy a relatively inexpensive OBD-II scanner (available at most auto parts stores). These plug into your car's OBD-II port (usually under the dashboard) and will display the DTCs. Many scanners also provide descriptions of the codes.
* Auto Parts Store: Most auto parts stores will read the codes for free. They can often give you a preliminary assessment of the problem based on the codes.
* Mechanic: A mechanic will be able to diagnose the problem and repair it.
2. Once you have the DTCs: Search online for the codes (e.g., "P0171 OBD-II code"). This will give you a better understanding of the potential issues. Remember, online information is for guidance only; a proper diagnosis requires a professional inspection.
Possible Causes (these are just examples, the actual cause depends on the DTCs):
* Loose or damaged gas cap: This is a common and relatively inexpensive fix.
* Oxygen sensor issue: These sensors monitor the air-fuel mixture. A faulty sensor can lead to poor fuel economy and emissions problems.
* Mass airflow sensor (MAF) problem: The MAF sensor measures the amount of air entering the engine. A faulty sensor can affect engine performance.
* Catalytic converter issue: This is a more expensive repair.
* Ignition system problems: Faulty spark plugs, wires, or ignition coil.
* Other sensor problems: Various sensors monitor different aspects of the engine's operation.
Don't delay: Driving with a malfunctioning system can potentially cause further damage to your engine. Get the codes read and address the underlying problem as soon as possible. Ignoring the light could lead to more expensive repairs later on.
