Do you have an obd scanner or acsess to one? "Should" have thrown a check engine light with a code to verify . Advanced Auto ($58 I think) has a life time warranty on their part.. but Bosch is the most dependable replacement. Cost less than the AA part on ebay if you can waite. Just replaced mine in a parking lot Monday evening after ordering one off Ebay Monday afternoon. Seems the code was 0335 or close to that. You can do a search on the forum to confirm.