Here's what you should *actually* do:
1. Identify the problem: The most important step! The check engine light doesn't tell you *what* is wrong, only that something *is* wrong. You need to get the diagnostic trouble codes (DTCs) read.
2. Get the codes read: You can do this in a few ways:
* OBD-II scanner: These inexpensive tools (available at most auto parts stores) can be plugged into your car's OBD-II port (usually under the dashboard) and will read the trouble codes. Many apps on smartphones can also do this with the right adapter.
* Auto parts store: Most auto parts stores will scan your car's codes for free.
* Mechanic: A qualified mechanic will be able to diagnose the problem and repair it properly.
3. Repair the problem: Once you know the problem, address it. This might involve replacing a faulty sensor, fixing a leak, or performing more extensive repairs.
4. Reset the light (if necessary): *After* the repair is complete, some scanners can clear the codes. Many modern cars will automatically turn off the CEL after a few successful driving cycles if the problem is truly resolved. If it doesn't clear automatically, a mechanic can do it using their diagnostic tools.
Do not attempt to reset the check engine light without knowing the cause. Ignoring the warning light is extremely risky.
