2015 q7 TDI - warbling sound from rear of car. What is it?
an odd and atypical sound has started coming from the back seat/underbelly area of my 2015 q7 with 85k miles. it warbles, it sometimes drones/howls. the frequency is steady at different speeds and unaffected by in gear or in neutral or rpm or brakes or turning Or under load or coasting. it shows up over 30mph and all the way to highway speeds. it sometimes goes away, sometimes shows up after driving some, more common and louder after the car sits a few days. seems to be increasing in consistency.
audi dealership couldn’t hear it. even with the audio clips I’m sharing here as comparison. had to create a video out of the audio file - couldn’t upload just audio. It’s the high frequency sounds that are out of character. Appreciate your thoughts.