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Under car rattle

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Old Feb 22, 2025 | 04:38 PM
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Question Under car rattle

Hi! I have some strange rattle sound that occurs at highway speeds. Here is a link to a similar issue with an avalon:

https://www.toyotanation.com/threads...video.1693657/

I hear the same noise and have a feeling it's the same thing on my 2020 UL350. Has anyone else encountered this? I took this to a local mechanic and they said everything was tight underneath; however, I'm not sure I trust their diagnosis.

Thanks!
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Old Feb 23, 2025 | 06:39 AM
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I recall no reports here of undercarriage noise not attributable to something that got loose and was quickly tightened up.
Your report is a bit confusing to me, as you report that you "have a feeling" it's familiar to something on a previous vehicle, but you report that a mechanic who, I presume, got under the car and nosed around, found nothing loose. When your "feeling" contradicts the empirical findings of someone with training and experience in the field, the next step, I would think, would be to seek a second opinion from another expert.
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Old Feb 23, 2025 | 10:23 AM
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Originally Posted by tfischer
I recall no reports here of undercarriage noise not attributable to something that got loose and was quickly tightened up.
Your report is a bit confusing to me, as you report that you "have a feeling" it's familiar to something on a previous vehicle, but you report that a mechanic who, I presume, got under the car and nosed around, found nothing loose. When your "feeling" contradicts the empirical findings of someone with training and experience in the field, the next step, I would think, would be to seek a second opinion from another expert.
Yep, I probably need a second opinion from another expert; I was just curious what others have experienced before I shell out more money. For others who had a rattle similar to this, do you recall what the problem was?
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Old Feb 23, 2025 | 10:38 AM
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Originally Posted by spyder24
Hi! I have some strange rattle sound that occurs at highway speeds. Here is a link to a similar issue with an avalon:

https://www.toyotanation.com/threads...video.1693657/

I hear the same noise and have a feeling it's the same thing on my 2020 UL350. Has anyone else encountered this? I took this to a local mechanic and they said everything was tight underneath; however, I'm not sure I trust their diagnosis.

Thanks!
Can you isolate if the rattle sound is from the front? Or the rear?

There was a rear end rattle thread a year or so ago. Neither denise2019lexus350 or scubapr posted if they ever found a resolution to their rattling noise but in that thread's post #16 I posted a link to UltraLux22 post in another thread that had this fix Lexus service department entry:

DATE 01/2020
DESCRIPTION: FOUND THE PLASTIC CAP ON THE LR TRAILING ARM FORWARD MOUNTING BRACKET HAD COME OFF AND THE CAP WA
SERVICE: DESCRIPTION: FOUND THE PLASTIC CAP ON THE LR TRAILING ARM FORWARD MOUNTING BRACKET HAD COME OFF AND THE CAP WA ~|~CUSTOMER STATES THAT NOISE WHILE DRIVING ALSO SOUNDS LIKE A LOOSE HEAT SHIELD. ATTENTION DOUG. ~|~ ~|~1307 FOUND THE PLASTIC CAP ON THE LR TRAILING ARM FORWARD MOUNTING BRACKET HAD COME OFF AND THE CAP WAS RATTLING AROUND IN THE FRAME POCKET. ATTACHED THE CAP TO THE BRACKET AND TEST DROVE, THE NOISE IS NO LONGER PRESENT. (DM) OUT MILES - 1409 READ LESS
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Old Feb 23, 2025 | 01:48 PM
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Originally Posted by grp52
Can you isolate if the rattle sound is from the front? Or the rear?

There was a rear end rattle thread a year or so ago. Neither denise2019lexus350 or scubapr posted if they ever found a resolution to their rattling noise but in that thread's post #16 I posted a link to UltraLux22 post in another thread that had this fix Lexus service department entry:
Thanks for your reply! From what I can tell, it is coming from the driver's side. I think it is also coming from the mid to rear part of the part. I think at least
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