2005 Cadillac STS Q&A

2005 Cadillac STS Question: My check engine light has recently began illuminating and then turning off, why?

My check engine light will illuminate for more days than not but it comes on for a few days and then it will turn off for a day. It seems to, possibly, come back on after the car heats up or has been driven 30 to 40 miles. I replaced the gas cap already. -
Answer 1
When light turns on take to your local autozone for free check. This will give you good direction to go in. -