It sounds like you already own this vehicle and are wondering if anybody would buy such a thing with these problems...If you bought this car new in 2000 and has any warranty let at all, I would pursue the dealership heavily. If the problem persists, I would investigate your state's "Lemon Laws" which might get you some relief for notorius problems the dealer cannot seem to fix.If you want specific help on a certain problem you are having with your transmission when braking, you will have to get much more specific. Chances are, you haven't been the only one with this problem! A complete transmission overhaul would set you back around $1500. If the price of the car was low enough to figure in this overhaul, yes... I would consider buying the vehicle. I lilke buying things cheap when I know how to get the problems fixed.The check engine light is related to the emission controls equipment. It comes on when a component associated with emission controls fails. Coming on twice for the same thing points us in one direction, coming on for two different things points us elsewhere. Again, you have to be more specific. If it keeps coming on because of an Oxygen Sensor failure, it wouldn't suprise me to find out that whoever is working on your car is using some form of silicone lubricant... I've heard that silcone products destroys oxygen sensors.So, to answer your question... I would find out what a 2000 Honda Passport is worth in a private sale by going to www.kbb.com. Then I would take that figure and discount it $500 to $1000 to make it a good deal. Then, I would assess how much it would cost to fix each problem and subtract that from the total. I would forward any and all information to perspective buyers and let them make the choice.If the repairs exceed the value of the vehicle, it's time to donate it to your local charity.Good luck!