i am trying to buy 2001 audi s8 from one guy he said he had water leaking into interior from under the hood i am kinda worrying about this because right now car has check engine with codes like abs and o2 sensor what else could be wrong with it what should i ask him and why water damage caused abs damage if abs pump is by the front headlight thx a lot also i cant see the car i will ship it so that's whats bothering me much