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Wolfgang, Audi master tech
Category: Audi
Satisfied Customers: 4662
Experience:  Senior Audi Master Tech 15 yrs
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We have a 2007 Audi q7 that has a high-pitched whistle that

Customer Question

Hi, we have a 2007 Audi q7 that has a high-pitched whistle that increases in pitch the faster we accelerate. The whistle typically begins around 35 mph, but just randomly appears and disappears. However, it's so frequent and so loud that we hate our car and wish we'd never bought it. Any suggestions?
JA: How old is the transmission? Have you checked the fuel filters?
Customer: We bought the car used last year so I don't know about the transmission, but I think we had the fuel filters replaced recently, along with spring plugs, etc. Audi did a check of the whole car before we bought it but didn't notice the whistle, which we noticed about a week after we bought the car. Since then we have had a mechanic shop also do a general service on it.
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: We'd like an idea of what the problem is so we can take it to a mechanic and give them an idea of how to approach it. Nobody seems to have any idea. One mechanic thought maybe drive train, but we'd like a better idea before spending thousands on maybe the wrong thing.
JA: Anything else you think the mechanic should know?
Customer: The whistle only occurs when we accelerate. It starts and stops randomly, and the pitch goes higher the faster we accelerate. If we brake and the start moving again the whistle goes away, but then usually starts up again around 30 or 35mph, sometimes higher. It's loud and sounds like it's coming from the front center of the car, between the room front seats maybe. You can hear the whistle even louder if we roll the windows down.
Submitted: 1 year ago.
Category: Audi
Expert:  Wolfgang replied 1 year ago.

Thanks for choosing Just Answer . I'm Wolfgang here to help!!

I am confident we can resolve your problem together. Please understand that I don't know your skill level. In most cases when you have a problem with the way the vehicle performs, specialized tooling is required to acquire computer
data/information or engine testing results. We didn’t build these complicated vehicles; we
just diagnose and fix them. Also understand that I can't see, smell, hear, or touch the
vehicle either, so it may take a few replies to get to satisfactory results. I am also going to
direct you with the fastest, easiest and most common things to check first. Please be
patient and permit me to do what I do best.
I also try to give all of the information you may need, expecting a “positive rating” in
return. I will also continue assisting you after you have rated me, if necessary. If there
is any reason I cannot get a positive rating, please let me know why “in advance”, so I
can go another direction for you. I am sorry you’re having this problem; I’ll help you
through it.
Below is my first answer or request for more information. If you do not understand it, or you need more information from me, or need me to go in more detail.

The most likely thing is the propeller shaft from the transfer case to the rear differential.

the propeller shaft has a center bearing. and that bearing is the noise and is about to fail.

the bad thing is that the whole propeller shaft is the correct fix (expensive) over $1000 for the part alone and about 3 hrs of labor.

there are aftermarket center bearings available but the success rate is less than 20% .

anything else?

if not.....

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