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Clunking Noise from Front Suspension on 2020 Lexus IS 300 - Over Bumps

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Mike T. · rep 0 · May 25, 3:27 AM · 1 replies · solved · Question

Vehicle: 2020 Lexus IS 300 F Sport

Hello Lexus owners,

I've got a 2020 Lexus IS 300 F Sport, and for the past few weeks, I've been hearing a distinct clunking or knocking sound coming from the front suspension, primarily on the driver's side. It's most noticeable when going over speed bumps, potholes, or uneven pavement at low to moderate speeds. It sounds like something is loose.

I've checked for anything obvious like loose lug nuts, but everything seems tight. The car drives fine otherwise, no pulling or steering issues, but the noise is starting to get on my nerves. I'm worried it might be something serious.

Has anyone experienced a similar issue with their IS 300 or other Lexus models from this generation? What should I be looking for, or what are the common culprits for this type of noise? Any advice before I take it to the dealer would be great.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:27 AM

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ClearTheCode admin answer:

A clunking noise from the front suspension, especially over bumps, is a common indicator of worn or loose components. Given your 2020 Lexus IS 300, it's a relatively new car, but certain parts can wear prematurely depending on driving conditions. Here are the most common culprits:

  1. Sway Bar End Links: These are a very frequent cause of clunking noises. The ball joints on the end links can wear out, causing play and noise when the suspension articulates. They are relatively inexpensive to replace.
  2. Sway Bar Bushings: The rubber bushings that hold the sway bar to the chassis can wear out, become dry, or compress, allowing the sway bar to move and create a clunking sound.
  3. Lower Ball Joints: Worn lower ball joints in the control arms can cause a clunking, especially when turning or going over bumps. This is a more critical component, as failure can be dangerous.
  4. Strut Mounts/Bearings: The top strut mounts or the bearings within them can wear out, leading to noise. You might hear a creaking or popping sound when turning the steering wheel, in addition to clunking over bumps.
  5. Control Arm Bushings: The rubber bushings in the control arms can degrade over time, leading to play and noise. Inspecting them for cracks or tears is important.

Diagnostics & When to See a Shop:

While there isn't typically an OBD-II code for mechanical suspension noises, a visual inspection by a qualified technician is crucial. They will lift the vehicle and perform a 'shake test' on various suspension components to identify play. They might also use a chassis ear to pinpoint the exact source of the noise.

It's highly recommended to have this inspected by a professional shop or your Lexus dealer soon. A clunking noise, especially from critical components like ball joints, can indicate a safety concern. Addressing it promptly can prevent further damage to other suspension parts and ensure your vehicle remains safe to drive. Don't delay, as worn suspension components can affect handling and tire wear.

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