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You need an OBDII device to identify the code that associated with the problem. The code allows you to identify the part or system so you can replace the faulty part(s).
You can either buy one ($50 up) or go to one of the auto stores and have them pull the code.
With the OBD device you can typically reset the code to shut off the check engine light (basically associated with the emissions). However if you do not fix the problem the light comes back on at some point.
I've got a small vacumn leak in the vapor system on my S90 that I've got ~$500 and it still not fixed.
Gregg
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