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Old 11-27-2010, 12:12 AM   #3
Registered User
Join Date: Apr 2010
Location: Murrieta, CA
Posts: 9,258
My Ride: '94 325iC & '00 323i
Why are you replacing the gas cap? Did you get a code to indicate an Evaporative Emission System fault?

There are literally a thousand and one reasons for the Check Engine light to come on. Going to the store and buying parts in hopes of hitting the right one is a poor troubleshooting technique. You really should buy an OBD II Scan Tool to pull the codes so you know which parts to put into your shopping basket.
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