Check engine light is on for a reason, the only way to fix it is a OBO scanner Since you didn't list any vehicle information Can't tell you which one you need Some dealers charge a $100 bucks to reset the light you can buy the scanner tool for less It will pay for itself in one use So a 1997 to today vehicle you need the OBO 2 scanner For vehicles 1996 or earlier you need the obo 1 scanner The scanner is the only way to reset the light You can pay hundreds for a mechanic or buy it and save hundreds One thing about shops In my 35 yrs of working in Automotive 90% of mechanics were thieves or dishonest about repairs

Specially if you know nothing about cars. Make model year is required info if you actually want an answer.

Hope it helps

Lr

A check engine light is designed to stay on if the underlying problem hasn't been fixed. Get the trouble codes read and fix the problem and the light will go off.

Find the code, fix the problem!

Get it checked out by a mechanic, get it fixed or find out what's wrong using an auto scan tool. You might also be able to reprogram the control modules with the scan tool, so you can turn off the fix engine light. But you definitely want to find out what's wrong though. You shouldn't ignore your car's warning lights. Not fixing a small problem now can lead to bigger and more expensive problems later.