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Metallic clicking sound?

Tiny
MOTLIB786
  • MEMBER
  • 2017 MERCEDES BENZ 220CDI
  • 2.0L
  • 2WD
  • AUTOMATIC
  • 61,000 MILES
Hi, I bought this car approximately 3 weeks ago. A couple days ago I started to notice a metallic clicking noise coming from underneath the car. It was all local driving no more than 3 miles. Once I returned home I turned the engine off and stepped out of the car and I could hear the noise. I’m not sure if this is normal due to metal expanding or if it’s catalytic converter. I would appreciate it if someone could advise. I've attached a video. Thank you
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Friday, July 21st, 2023 AT 11:25 AM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
I don't see the video, its takes awhile on mobile so please allow time for it to load. Yes, it does sound like the exhaust system though.
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Saturday, July 22nd, 2023 AT 2:50 PM
Tiny
MOTLIB786
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  • 3 POSTS
Hi, thank you for your response. I've tried uploading the video again. I would appreciate it if you could let me know your thoughts. Thanks
Video (Click to make bigger)
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Saturday, July 22nd, 2023 AT 3:33 PM
Tiny
KEN L
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Thanks for the video. yes, that is the catalytic converter and exhaust system cooling down which is normal, can I ask if the engine is overheating? Also, does the engine seem to have normal power output? If the converter is getting clogged up it can get hotter than usual. This guide can help you check it:

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

I assume you have never heard this noise from the car before. Just to let you know this noise can be normal.
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Sunday, July 23rd, 2023 AT 1:55 PM
Tiny
MOTLIB786
  • MEMBER
  • 3 POSTS
Thanks for getting back. The car drives all fine no difference in power output. The temperature seems all fine based on the gauge. It stays at 80. The noise was only noticed a few days ago but it seems to happen if the car has been driven as little as a couple of miles. I wasn’t sure if that was normal. The car has been booked in with a local garage so I’m hoping if there’s any issues, they’ll be able to spot it. Thanks
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Sunday, July 23rd, 2023 AT 3:02 PM
Tiny
KEN L
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  • 48,363 POSTS
Sounds good, I don't think anything is wrong with the car, but you never know. Please let me know what they say.
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Monday, July 24th, 2023 AT 11:05 AM

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