My "service engine soon" light came on tonight while I was driving home. I'm not really too sure why it would come on but I did recently have my exhaust done and CAI. I took a quick look under the car to see if the 02 sensor cables might be the cause but everything looks ok there. I had a shop install a catted bassani x-pipe about 2 months ago and I also installed upper and lower WMS CAI about 1 month ago. Could my problem be with the 02 sensors or the air temp sensor in the upper CAI?