Clanking noise from exhaust/catalytic converter area after shutdown

ToyoBMW

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Has anyone else heard clanking noises from the exhaust and catalytic converter after shutting off the car? I have a little over 500 miles on my car now and when I shut down the car after driving, I heard a metallic clanking sound under the car. It's like if the metal parts are cooling off. It's really annoying when it's in my garage, but it goes away after about 5 minutes. I never noticed this for the first 500 miles.
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KeshyMKV

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Has anyone else heard clanking noises from the exhaust and catalytic converter after shutting off the car? I have a little over 500 miles on my car now and when I shut down the car after driving, I heard a metallic clanking sound under the car. It's like if the metal parts are cooling off. It's really annoying when it's in my garage, but it goes away after about 5 minutes. I never noticed this for the first 500 miles.
I was concerned about this as well, as it sounded like little pebbles bouncing all over the place in the exhaust. When I was still in the break in period as well. Currently at 1,700 miles. I brought it up to the dealer and it is completely normal. This is a BMW exhaust "feature" if you will. It cooling down, but generally louder than any car I have ever owned. If you are driving and sitting at a traffic light at idle, you can hear it as well after driving the car in sport more spiritedly. I have heard this on some BMW vehicles as well and thought it sounded just like the Supra. It is nothing to be concerned with. I have heard this same sound on a friends Supra as well.

I will say, after I upgraded to a Frequency Intelligent cat-back exhaust, that sound is completely gone. I hear the usual/expected exhaust cooling when turning vehicle off.

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Z8AKU

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This is completely normal. It's the metal expanding and contracting when it's heated and then cooled. After break-in period it will be more quite.
 

swat-spence

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Mine does the same thing, noticed it a little more last night. Was 27f out and only ran it a couple of miles. Lot of expanding contracting. Normal. I have a Raptor that does the same thing.
 

Jree

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Do you hear this noise while driving too?

I hear it while Iā€™m driving
 
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ToyoBMW

ToyoBMW

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Do you hear this noise while driving too?

I hear it while Iā€™m driving
I hear it only when the car is shut down
 

nameless.a90

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@ToyoBMW did it sound like this? Its at the end of the video...

https://www.kapwing.com/videos/6099bdca36f95a008da3c373

I have a 2021 and it made a weird clanking/rattling noise when i shut it off this morning after a "spirited" ride...

I am concerned its something big... but after I let the car cool down i turned it back on and let it run for 10 minutes and turned it off again the noise disappeared?
 
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ToyoBMW

ToyoBMW

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@ToyoBMW did it sound like this? Its at the end of the video...

https://www.kapwing.com/videos/6099bdca36f95a008da3c373

I have a 2021 and it made a weird clanking/rattling noise when i shut it off this morning after a "spirited" ride...

I am concerned its something big... but after I let the car cool down i turned it back on and let it run for 10 minutes and turned it off again the noise disappeared?
Mine did not sound like that, mine is from the catalytic cooling down. There's something definitely wrong with your car. I would keep that video and show it to your Toyota dealer. Fix it while it's still under warranty
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