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There are many things that can cause your check engine light to come on. When it does come on, this means the computer has detected a problem with the vehicle. Every car has this system. Anytime it is on, you can usually get a code number off the computer scan. The hookup is under the dash in most cars. You can buy a cheap one for around 50 dollars at most auto part stores. If you do buy one, you may need to find what each code means. If you don't own one or you can't get to one, you can take it to Autozone or Advanced Auto Parts to get your vehicle scanned. Most places do not charge for the scan. Autozone and Advanced Auto Parts do not charge when your check engine light is on. They will be able to scan it for you and give you the codes. They will let you know what it says and what parts you will need as well. if you ask. If your check engine light is flashing, this means there may be internal engine failure. If this is your case, get it scanned as soon as possible. The longer you go with the light on, the greater the chance you have to make the problem worse. Some of the newer vehicles has this system already built in. You will need to know sequence though, to make the code appear.
The engine malfunction or check engine light could mean a whole number of different things, you need an obd diagnostic tool to read the trouble codes...
was the light on before you took the vehicle in for repairs, or did it come on after repairs, if someone has worked on the engine, all I can suggest is check that they haven't left any electrical connections off any components, that will cause the light to appear...
You need to scan the computer for trouble codes. If the light was on, there must be codes set. On a '95 Buick, it would be OBD-1, On Board Diagnostics-first generation ('96 and later is all OBD-2). The diagnostic connectors are different for OBD1 and OBD2, but in '94 and '95, GM was on some models using a "hybrid" diagnostic link connector. You will just have to find the right diagnostic connector to get your codes. The guys at autozone or a national parts store who do engine scans for free may help you figure it out. If it is a straight forward OBD 1 connector, a cheap code reader could scan for trouble codes. For the OBD1, you can also use a jumper wire between terminals A & B of the diagnostic link connector. Turn key to on, and two digit codes will begin to flash on the check engine light. Code 12, for instance, would be a flash, pause, two short flashes, and longer pause before the next code appears. Code 12 by the way, just means that the computer is in diagnostic mode-after that any set codes will appear or be flashed. Code 55 may also be flashed-this code means the end of codes that are set.
It could be serious, or it could be very minor. The check-engine light simply means that something has happened and has set a code or codes indicating a failure or problem with something in the engine. Go to AutoZone and ask them to scan the computer (it's free, and a shop will charge an hour's labor to do this). Get the code(s) they give you and post them here as a reply/comment, and we can help you solve the issue.