My son's car is very temperamental and the check engine light comes on when he doesn't close the gas cap properly. He should take it to our mechanic so they can figure out the trouble code. Luckily he didn't have any major problems, but at least that way he would know if he had to accept it. It's small and handy to keep in the glove compartment of his car and it only takes a few minutes. do a diagnostic test. The way cars are today, everyone should have one in their car.
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