One of our Fairfield County, Conn. reporters, Anthony Buzzeo, recently encountered a "check engine" light mystery. I asked our Facebook readers if they'd encountered similar problems. Here are some responses.
Anthony Buzzeo: The "check engine" light in my car turned on, so I took it to the mechanic who told me it was because I used Citgo Gasoline. Apparently the mechanic believes Citgo gas is "too lean" for my car, and he suggested using Shell or other more expensive brands. I thought it was interesting and figured I would pass it along.
John Ehrlich, Chappaqua, NY: Your engine light went on because there is likely too much air in your gas tank. Fill up and the check engine light will likely go away. This also helps your gas mileage since the miles per gallon decline slightly as your fuel level goes down. It typically does not matter what brand of gas you choose to use. But fill-up: don't just put in $10 worth. The cause is the oxygen in the free space in the tank, not the brand.
Anthony B: It is true filling up again shut off the light. I don't know too much about cars, but I always fill up my tank, and the mechanic I spoke with did say the brand matters.
Susan Frank, Mamaroneck, NY: I drive a Honda Accord with a four-cylinder engine, and it takes regular gas, as opposed to high-test. I often get gas at inexpensive no-name gas stations. I had found that my check engine light would come on shortly after having filled up. What I was told was that it will happen if the gas cap hasn't been tightened sufficiently. I now turn it so that it clicks many times. At this point it rarely happens. Also, here's a link to some info from about.com.
Sue Fine, Fairfield, Conn.: My "check engine" light goes on when the car is too cold or too hot. I think it's just registering complaints about extreme weather.
Do you have a car mystery? Let's crowdsource it together. Let me know here and I'll post it on all Main Street Connect Facebook pages.