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Will a check engine light appear for low tranny fluid?


I am always very careful checking the car, however when I got back to my garage there was a whole lot of fluid on the floor waiting for me. I bet I drove 250 miles today and never noticed anything out of the ordinary. I was wondering if it was likely the transmission o-ring that everybody seems to have problems with. it's about 49 thousand miles on the car with more than half of those in the last year and a half. No lights have come on. Doesn't seem to have a noticeable color. And leads on what to check would be appreciated.