Here's what you should do:
1. Diagnose the problem: The SES light is triggered by a trouble code stored in the car's computer. You need to retrieve this code. You can do this in a few ways:
* OBDII scanner: This is the best option. You can buy a relatively inexpensive OBDII scanner (available at most auto parts stores) that plugs into your car's OBDII port (usually located under the dashboard). The scanner will read the trouble code(s). Note the code(s) down – you'll need them.
* Auto parts store: Many auto parts stores will read the codes for free. Just bring your car in.
2. Interpret the trouble code(s): Once you have the code(s), you can look up their meaning online. Many websites and forums provide explanations of OBDII codes. Knowing the code will help you understand what system is malfunctioning.
3. Repair the problem: Based on the trouble code, repair the issue. This might involve:
* Replacing a sensor (oxygen sensor, mass airflow sensor, etc.)
* Fixing a leak (vacuum leak, coolant leak, etc.)
* Replacing a worn-out part (spark plugs, ignition coil, etc.)
4. Clear the code (after repair): *Only after you've repaired the problem* can you clear the code. Most OBDII scanners have a function to clear codes. Some advanced scanners even allow you to erase specific codes. After clearing the code, start your engine and drive it to see if the light returns. If it does, the problem wasn't fully resolved.
Important Considerations:
* Don't just clear the code without fixing the problem: This will only temporarily turn off the light and could mask a serious issue that could cause further damage to your engine.
* If you're not comfortable performing repairs yourself, take your vehicle to a qualified mechanic: They have the tools and expertise to diagnose and fix the problem correctly.
Simply unhooking the battery or using a cheap "code clearer" without knowing the underlying problem is not recommended. It's a temporary fix that doesn't solve the root cause. Always diagnose and repair before clearing the code.
