Hi people..
...Tonight after chasing my friend's 2002 audi a4, there was this Annoying Loud buzzing sound from the right side of the engine... and when i shut off the engine after i got home, it still made a sound (then faded away) what IS this SOUND??? My friend who was sitting in the passenger seat said he felt a vibration near the feet area.. the mechanic said it COULD be something w/ the torque ...(pulling out of his ***) please help me.. do u kno what this sound is? its like a loud buzzing hummm.. help

 

Is the sound outside or inside... can you hear it with your head under the hood?

If it is outside, i'd look at either an exhaust leak, busted heat sheild.

 

its not the low coolant buzzer is it?