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There could be any number of causes, depending on the vehicle. Sometimes they just want you to take the car in for service to have the oil changed. Other times it could be the MAP sensor, oxygen sensor or some other intermittent problem. Get a code reader for your vehicle and plug it in during that 2 day period when the light comes on. Follow the instructions in the code reader manual to find out what's going on. The internal computer knows what it thinks is going on and is more than willing to tell you if you get and use a code reader. I had this problem and it was my EGR valve which is about a $65.00 part if you have a mechanic friend that can help you. We also changed my gas cap, which did not work by the way.

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16y ago
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Q: Your check engine light comes on for about 2 days then it disappears for a while and it comes back on what could cause this I have a 99 Chevy Malibu with 90000 miles?
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