After i changed the oil on my 02 a4 i noticed as i excellerate there is a low hum, thats get louder as i excellerate, when i heard this i got scared and was thinking crap is my belt gonna break so i immediatly pulled it out of gear and let the engine go to idle, i was at 70 when i did this and noise didnt go away, i felt some releaf but not the question is what is it? is there an easy way to tell if my car has had the belt dont or should i jsut bring it to the audi place and let them give it a once over. Has anyone heard of this before is it a tire issue, maybe a bearing??

TIA Ironman

 

wheel bearing by the sound of it jack each wheel up and spine it to see which makes any noise

 

when my front left bearing went out it sounded like an out of balance/flat tire - just a low wom wom wom wom wom. I love makind noises on these forums

If it comes back, and speads up with acceleration and not with what gear you are in then it is your wheel bearing. not the easiest of jobs - I got my bearing from Purems and had it installed - guy charged me $200 to install it. - they have to either take control arms all apart or kinda rotate everything and get a press in there to pop out the bearing. not the weekend warrior kind of DIY,

 

well im glad its not the timing belt but i guess it needs to be done, any idea on what i need to look for in timing belt noises, jsut so i know i cant tell when the belt was done, id like to get an idea of when to change it.

 

I had a similar noise coming from right underneath me as I was driving and it was the connection to each cat from the exhaust... It had a slight hole and audi wanted 1400 to replace the entire thing... I bought the brace thing that connects the two for 24 dollars at autozone ( that was for the two ) and had a guy weld it on and that took care of the problem... Just wanted to throw out some other possiblities seeing as the sound you described could've come from anywhere

 

thanksNYgiants all help is apprecaited im gonna jack it up again and spin the tires to see if i can make them squeek, then ill go from there