Was driving home from store CEL light just came on.. ... when i got home I tried jumpering ports 8 and 13 to get the CEL code but the light just came on and stayed on again without blinking or anything . Didn't seem to have any problems when i was driving it. i have a 2001 4cyl ULEV manual. what you guys think? Does the light come on if its time for normal service... it has about 40800 miles on it....