2009 Hyundai Sante Fe mpg reading fluctuates
After a lady side swiped my car, had repair done requiring welding. Now, mpg reading fluctuates wildly. They claimed they unhooked negative cable b4 welding MPG reading goes from 20 to 99 to 6, etc.
Not knowing the intricacies of this particular system, I can only say that it could be possible that they didn't disconnect it, but then I would believe that if that were true, you would have a lot more problems then just the crazy MPG readings. Most likely it is just coincidental to the time the car was worked on and really has nothing to do with it and could just be a failed part in the system of that the on-board computer needs to be re- flashed or updated for some reason.
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