C Class S205 Electronic Clicking Sound - Driving me mad
Thread Starter
Newbie
Joined: Apr 2022
Posts: 6
Likes: 1
From: Bumblehole, UK
C200 S205 AMG Line
C Class S205 Electronic Clicking Sound - Driving me mad
Hi Guys,
I have searched the forums, but couldn't find a thread that matches my problem exactly.
I have a 2017 C Class S205 AMG Line with 40k on the clock. I've only had the car for around 6 weeks, and it is making the most annoying sound when driving at low speeds.
See https://youtu.be/9r7TUuGc3Xw for a short and terrible video that doesn't exactly capture the annoyance of the sound, but was the best I could get my wife to do a few evenings ago. It seems to come from the passenger side behind the dash near the windscreen.
The sound I am getting is so fast and so electronic it is hard to describe. Basically an incredibly fast clicking cricket stuck in my dash. It is not excessively loud, but very noticeable regardless - again hard to describe. I have to put music on straight away. as it is so annoying. It is worse when travelling up to around 40mph. I think past that the road noise hides the sound. It is definitely worse when the engine is cold, and the pitch of the noise increases with acceleration. There is no noise at idle, or when stopped. It only engages when the car accelerator is pressed, and does change slightly as it shifts through the gears (auto).
The car is going in for a NOX sensor replacement next week, so I thought I would try and mop this issue up at the same time. The dealer has already plugged the car in and it only flagged a NOX sensor issue, so I am hoping it is nothing serious. I have told them about this, but they didn't seem too interested in looking into it, and said they heard something and are changing an engine clamp - but I am pretty sure it is not that.
https://youtu.be/9r7TUuGc3Xw
Any help greatly appreciated.
Thanks
Moussaka Dave
I have searched the forums, but couldn't find a thread that matches my problem exactly.
I have a 2017 C Class S205 AMG Line with 40k on the clock. I've only had the car for around 6 weeks, and it is making the most annoying sound when driving at low speeds.
See https://youtu.be/9r7TUuGc3Xw for a short and terrible video that doesn't exactly capture the annoyance of the sound, but was the best I could get my wife to do a few evenings ago. It seems to come from the passenger side behind the dash near the windscreen.
The sound I am getting is so fast and so electronic it is hard to describe. Basically an incredibly fast clicking cricket stuck in my dash. It is not excessively loud, but very noticeable regardless - again hard to describe. I have to put music on straight away. as it is so annoying. It is worse when travelling up to around 40mph. I think past that the road noise hides the sound. It is definitely worse when the engine is cold, and the pitch of the noise increases with acceleration. There is no noise at idle, or when stopped. It only engages when the car accelerator is pressed, and does change slightly as it shifts through the gears (auto).
The car is going in for a NOX sensor replacement next week, so I thought I would try and mop this issue up at the same time. The dealer has already plugged the car in and it only flagged a NOX sensor issue, so I am hoping it is nothing serious. I have told them about this, but they didn't seem too interested in looking into it, and said they heard something and are changing an engine clamp - but I am pretty sure it is not that.
https://youtu.be/9r7TUuGc3Xw
Any help greatly appreciated.
Thanks
Moussaka Dave
Thread Starter
Newbie
Joined: Apr 2022
Posts: 6
Likes: 1
From: Bumblehole, UK
C200 S205 AMG Line
Thanks for the reply Matt. Yeah, the tyres are fine. The video isn't great I'm afraid. It is a clicking undertone to the sound you can hear. In person it is really noticeable. Almost like when you click a comb with your fingernail, but constant.
MBWorld Fanatic!
Joined: May 2018
Posts: 1,246
Likes: 243
W205 2015
I can bearly hear it. If it not extremely annoying i recken you live with it as the dealer will charge $$$. Bt the way is the car under warranty?
if you put music can you still hear it?
Is there any mulfunction in the car?
Sorry about the questions but its a rare case. I hear about heard rest making noises including mine. My dealer wants me to buy a new headrest. When he told me the price I became in love with the sound of head rest 😂
if you put music can you still hear it?
Is there any mulfunction in the car?
Sorry about the questions but its a rare case. I hear about heard rest making noises including mine. My dealer wants me to buy a new headrest. When he told me the price I became in love with the sound of head rest 😂
Thread Starter
Newbie
Joined: Apr 2022
Posts: 6
Likes: 1
From: Bumblehole, UK
C200 S205 AMG Line
Hi Andy. The car drives fine tbh. My wife says the same - she says just put the radio on! It isn't under warranty I'm afraid. With the music on you can't hear it. Agreed re the dealer costs :-) I'll learn to love it. Thanks a lot.
MBWorld Fanatic!
Joined: Oct 2018
Posts: 1,430
Likes: 820
From: Florida
2018 AMG E43
Just a thought... I think each of our HVAC vent tubes have an electrically actuated valve to throttle airflow. Could there be a possibility one of these valves are stuck and the actuator is constantly trying to overcome it?
I don't know, but may be worth looking into.
I don't know, but may be worth looking into.
MBWorld Fanatic!
Joined: Oct 2018
Posts: 1,430
Likes: 820
From: Florida
2018 AMG E43
I just noticed you said "the pitch of the noise increases with acceleration", so maybe not an HVAC issue afterall unless the incoming fresh air flow increase is causing a flutter? Again, I don't know, just throwing ideas out. 
Strange.
Strange.Last edited by Keith66; Apr 5, 2022 at 11:17 AM.
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MBWorld Fanatic!
Joined: May 2018
Posts: 1,246
Likes: 243
W205 2015
I envy you. My wife wants everything to be perfect. She keeps on telling when you will fix this headrest and frankly am out of excuses 😅 so i decided to get an official quote from my dealer maybe the dear wife will start loving my headrest as well. 🤗
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