F83 Metal Rattling Sound Coldstart

[oneknightr]

There's a metal rattling sound when idling after a coldstart. I think the noise goes away after we drive a bit but I don't know for sure. I don't know what prompted me to, but I decided to tap the rear bumper with my fist the other day and I heard the noise. Sounds like something is loose. I'll ask the service center to take a look at it when I bring it in for the next service, but that won't be for another 6000 miles. I just want to know if this is sounds serious or not. Thanks in advance!

[TrauCon]

Originally Posted by oneknightr

There's a metal rattling sound when idling after a coldstart. I think the noise goes away after we drive a bit but I don't know for sure. I don't know what prompted me to, but I decided to tap the rear bumper with my fist the other day and I heard the noise. Sounds like something is loose. I'll ask the service center to take a look at it when I bring it in for the next service, but that won't be for another 6000 miles. I just want to know if this is sounds serious or not. Thanks in advance!

I have the same noise but with an after market diffuser.

[oneknightr]

Originally Posted by TrauCon

I have the same noise but with an after market diffuser.

So is the rattle coming from your aftermarket diffuser?