The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to a parts store or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.
get the computer scanned to find out what the problem is.
Something may be wrong with the engine, and you might need to check it.
have vehicle scanned to determine the problem
i have a 2004 chevy monte carlo and the service engine soon light is on what does it mean?
Check engine lights come on for several reasons. I own a 98 Monte and my check engine light comes on alot. It could be any thing from a un clipped sensor, fuse, oil needs changed or checked. Take it to Pep Boys or Autozone they check out your check engine light for free.
unhook a battery cable for about 3 minutes and re-hook.
Usually a problem in the emission control system - have vehicle scanned to determine the problem
thermostat
check your break fluid.
The easiest way is to simply unbolt the battery cable for a couple of minutes. However, if you haven't fixed the problem that set the check engine light it will simply come back on again.
Check your coolant level...
How do you take a rheostat out of a 2003 monte carlo