Ok there is a difference between the check engine light and service vehicle soon light. The service vehicle soon light comes on when a bulb is out on the daytime running lights. Check your bulbs if there is one out and you put a new one in it will most likely take car of problem.
Hi,
olds aleros and pontiacs have qwerks like those, I had a 97 grand prix that was quite qwerky. We went through the mill to get the service light out, it was the spark plug wires, plugs and dirty injectors to get that light out, its the exhaust mixture sensor sensing an incomplete burn that turns that light on, may be others but that one for sure. probably have a sensor loose, dirty, busted or grounded at one of the wheels for the abs, fix that and the trac button will probably start working again. hang onto the olds if you can , it will be worth money someday.
good luck
J
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