hi my door locks dont work even with the button on the remote and the button on the door i have to push them down to lock and open door from inside does anyone know anything or how much to fix

 

Sounds like your central locking pump. We have vacuum-operated locks, the vacuum for which is supplied by a pump in the trunk. It's on the passenger's side behind the carpet. The impeller on said pump is made of graphite and tends to shatter when it gets old. They're quite expensive to buy new but if you google "central locking pump fix" you should be able to find plenty of threads on fixing it. You might also try keeping an eye on the classifieds for a part out or rummaging through a junk yard for one. Any B5 A4 or Passat pump can be made to work with a bit of light modification.

 

^^ This. I had the same problem last spring and replacing the central locking pump fixed it.

 

ok i checked the motor out and when i push the unlock and lock button the motor makes noise so i think the motor is working what else could it be ?

 

Could be a vac leak someplace between the pump and the doors. There's vac hoses leading up from the pump forward, check those next.

 

ok so it turns out to be the central lock system i open it all the way up and its all crack peices so i have a qustion whats the diffrence between these models or are they the same AUDI CENTRAL DOOR LOCKING VACUUM PUMP 8L0 862 257 N OEM AUDI CENTRAL DOOR LOCKING VACUUM PUMP 8L0 862 257 b OEM
does the n and b have any diffrence

 

Obviously they're different if the numbers/letters are different. What car is it from?

Like CCA4 said, when buying a replacement - look for one either from a B5 Audi A4 or S4 or a B5 Volkswagen Passat. They should all have the same/similar central locking pump.