hey everyone great to join you guys in the audi forum.
I just bought an audi a4 1998 quattro and really happy with it, but few problems. for all you b5 owners and experienced b5 owners i have a question?

im not sure wat its called or might be the prom but i feel my back differential is bad, hear a bad rattling noise when i hit 45mph and take wide turn. i wonder what it could be. so if someone can help?

also my whole alarm system is fudge i guess the best advice would be go to the dealer but if there another way then tha woud help way more, wats going on with y alarm is the lock button inside and the driver side door wont open with the key and the lock buton wont lock any door. so some help with that thanks

 

the central lock system is vaccum driven, so it might be a leak somewhere, or a switch is bad. rattling could be anything from a bad brake dust cover, or a bad axle...I would need some more info...