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Q: My check engine light is on on 2000 Mazda Protege

When I went to get a oil change. My check engine light started coming on after. I went back the next day and the people wher I had gotten my oil change hook it up to a machine and the light went off. It stayed off for a while but, now lately I have notice that the check engine light nevers goes off.
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The check engine light is trying to tell you that the computer has detected a malfunction in the engine control/emissions system. It's possible that if the dipstick was not properly seated and sealed in the dipstick, that the computer would sense the leak but I don't know for sure. Also, if the gasket on the oil cap were damaged or missing, it would cause the same kind of leak. It's also possible that the oil changer opened your air filter enclosure to try to sell you an air filter and didn't close it up right.
I guess the oil changer guy simply erased the code and didn't tell you what it was. Didn't do you any favors..
When the check engine light's on, the computer has stored diagnostic codes and data. Get a Mazda specialist to put a scanner on the car and tell you what's wrong. If you give me the codes I can explain them to you.
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