Buzzing sound

Hello, I had my 407 vehicles serviced approximately 2 weeks ago. However, an annoying buzzing sound began to sound from the back of the car yesterday. When the car is idle, it does not sound hum. Could you give information about why this could be caused?

have the exhaust system checked.

Guys, we've done the buzzing sound. But it was a little expensive. the rear polye ball of the vehicle is degraded due to degraded master snow water. I bought the original piece for 230 TL and gave 50 TL of workmanship. Don't you think it's expensive?

yes the piece is a bit expensive normally you can find it between 170-190 tl. Nothing to do, I am glad that your problem is solved now.

Thank you sonerkyl