‘17 Intermittent knocking noise on passenger side

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Mar 13, 2024 | 08:47 AM

Taki2828

Thread Starter

10th Gear

Joined: Feb 2024

Posts: 12

Likes: 4

‘17 Intermittent knocking noise on passenger side

Hi,

Used 2017 RX350, 125K miles.
Lexus service center inspected along with 2 other repair shops.

Following replaced:

Rear Shocks
Rear Sway Bars
Front Engine mount
Front Right Engine Bottom mount
All Fluids replaced(oil, brake, transmission, coolant)

Sunroof was adjusted, no longer making noises that sound like it comes from the rear trunk.

Front Shocks and Front Sway Bars inspected, no issues.

There is still an intermittent Knocking Noise, while driving between 0-30MPH. Knocks between 5-10 times then goes away. Happens early in the morning when driving out of apartment parking lot, car parked outside. Does not occur every day though.

I also notice in the morning when I press the Brake pedal to start the engine, the brake pedal is harder to push, does not go all the way down but engine starts fine. When driving during the day, the brake pedal is soft and goes all the way down when starting the engine. Is this normal?

Any suggestions? Minor but still annoying not knowing what the root issue is. Sounds like it is coming from Right passenger side, not sure front or rear.

Mar 13, 2024 | 12:07 PM

krathod

1st Gear

Joined: Mar 2024

Posts: 1

Likes: 1

17 Intermittent knocking noise on passenger side

Hi,
I have noticed the same issue when I purchased my RX350. I took it to the dealer and there was no fix.
It will only happen when you fill gas tank fully.

Mar 13, 2024 | 01:36 PM

Taki2828

Thread Starter

10th Gear

Joined: Feb 2024

Posts: 12

Likes: 4

Quote:

Originally Posted by krathod

Hi,
I have noticed the same issue when I purchased my RX350. I took it to the dealer and there was no fix.
It will only happen when you fill gas tank fully.

That is frustrating…

Mar 13, 2024 | 03:43 PM

hfahmy

Instructor

Joined: Oct 2005

Posts: 757

Likes: 61

From: GA

There is a tsb for gas tank knocking https://static.nhtsa.gov/odi/tsbs/20...53199-9999.pdf

sounds involved and you are probably out of warranty

Mar 13, 2024 | 06:26 PM

Taki2828

Thread Starter

10th Gear

Joined: Feb 2024

Posts: 12

Likes: 4

Quote:

Originally Posted by hfahmy

There is a tsb for gas tank knocking https://static.nhtsa.gov/odi/tsbs/20...53199-9999.pdf

sounds involved and you are probably out of warranty

Thank you. I don’t think that is it. Knock noise is on the passenger side. One of these days I have to try and record the noise. What I call knock might be a clunk, lol.

You are correct, no warranty, super expensive to fix.

I will note the times and see if it’s temp related, only during colder weather.

Mar 13, 2024 | 07:15 PM

jcg0324

Instructor

Joined: Feb 2021

Posts: 835

Likes: 408

From: PA

You might want to invest in a Steelman chassisear. It's model # 06600. I have one at home and have used it several times. It works very well. Here is the webpage:

https://steelmantools.com/products/chassisear