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I'm looking at a 98 with 14,000 miles on it however the check engine light is on. One of the rear tire sensors is not working as well. Are there any "common" causes for this year?? I guess the simple answer is to bring it to a dealer.
The tire sensors have a limited life span of about 5-7 years. If you get the car, plan on installing new ones some time in the future.
As for the Check Engine Light (CEL) it could be one of 200 things. The C5 has a built in code reader. Here is a cool link on how it works and what the codes mean: