My check engine light went off after I went over a bump?

It may be that the light just happened to turn itself off at that time. Some codes will reset themselves based on various things like hours, miles, and starts. A flashing check engine light usually means that the problem is serious and or happening at all the time. A steady light usually means the problem is no longer happening or its a more minor problem. It may have just been time for it to reset itself because the problem was no longer happening and enough time, miles, or starts had passed.

If the dealer is willing to still look at it and maybe help with the repair I would still bring it to them. The code will still be stored in the system so they will be able to check it and see what it was even if its not still a problem. Temp sensors are usually not that expensive and are easy to test.

I would continue driving, hoping it was just a flaky connection to the sensor that got jarred into place. Merry Christmas!

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Just keep driving it,you can't fix it if it's not broken,,,,,,,,,,,,,,,,