What are possible causes for"check engine light" being on continuously. 1997 Buick
Here’s a list of SOME of them: http://www.obd-codes.com/trouble_codes/
Take it to a chain-type auto parts store. Most will scan it and read the codes for free. Write down the exact code (as in “P1234”) and you can post it here.
Anything from a loose gas cap to a misfire in the spark plugs can cause a check engine light
The possible causes is a list 634 pages long. And that is just the most popular ‘P’ codes, not all of them.
The cause is a simple as hooking up a scan tool and retrieving the code. Many auto parts stores will do this for free.