3.0tfsi engine knocking sound

[rolas27]

2017 A6 43k miles. I get this strange knocking sound from the top back of the engine. It looks like the sound is coming from the supercharger.

Car runs great otherwise, no loss of power, no errors in VCDS except “Oxygen Sensor Failed or Incomplete” in “Readiness”.

This sound only occurs when the engine is warm and on idle. It disappears when I accelerate.

Car slightly vibrates on idle and RPMs jump in range of 690-710. Did anyone deal with this? Is this normal?

Video:
https://youtu.be/MQMiGcnPpbc

[paul-g]

weird sound almost like a vacuum leak but video's can sound much different

[rolas27]

It’s just a faint knocking sound (kinda similar to diesel engine sound)

[Nick_elgy]

2017 A6 43k miles. I get this strange knocking sound from the top back of the engine. It looks like the sound is coming from the supercharger.

Car runs great otherwise, no loss of power, no errors in VCDS except “Oxygen Sensor Failed or Incomplete” in “Readiness”.

This sound only occurs when the engine is warm and on idle. It disappears when I accelerate.

Car slightly vibrates on idle and RPMs jump in range of 690-710. Did anyone deal with this? Is this normal?

Video:
https://youtu.be/MQMiGcnPpbc

I’m having this same problem what was end result??


2016 Audi A6 prestige black optic. No mods yet