sorry you both (seller and you) were conned.... would you really want to waste your time and money to sue the seller?!? imo it is not worth it. check your contract with them...they probably did not express any warranty of any sort about it that will make them liable to whatever claim you want.

how worst could it get?!? what if na-ondoy yang oto na yan and the last owner had the electronics replaced (explaining the low mileage of the odo) for it to work.

look into the brightside...you have a cheap sedan that will probably last you another 5 years or more before you decide to sell it.