sherrrm

For the past few days my 2017 C43 coupe with 21k mikes has made a very loud rattling/knocking sound coming from the engine bay. I can’t identify the source.





I’ve checked the oil and it was somewhat low so I put a quart of Mobile 1 5w40 in which didn’t fix the issue.

I’ve noticed that the sound 99% of the time only makes this sound while my car is at somewhat of an incline.. if it’s on flat ground, it typically doesn’t make the sound. I was due for service anyways so I just dropped the car off at the dealership and showed them the videos.

If anyone knows what this issue is or know anything about it, please let me know so maybe I can help the dealership fix it.

sherrrm

Anyone?

I saw a few threads with the same sound but I didn’t see any info regarding it so I assume a few people have dealt with this.

Any help is greatly appreciated. Thanks.

RichardCranium3

First I've seen anything like this on our cars. Tough to tell from the video, is it a metallic or plastic sounding impact? To me, it sounds like plastic - maybe something caught in a fan somewhere?

foxberry

Deleted

waisoserious

What did the dealer say?