A Guide to Replacing Suspension Struts on the 2017-2024 Lexus RX350
Restore your Lexus's signature smooth ride by understanding when and how to replace your suspension struts.
- KYB is an OEM supplier for Lexus, making their aftermarket struts a top choice for restoring the original ride quality.
- Symptoms of failure include a bouncy ride, clunking noises over bumps, and excessive nose-diving when braking.
- Always replace struts in pairs (both front or both rear) and perform a wheel alignment after replacing front struts.
- Be aware of a TSB (L-SB-0030-19) for a rear suspension squeak on 2016-2019 models that is not related to the struts.
Is Your Smooth Ride Turning Bumpy?
The Lexus RX350 is known for its exceptionally smooth and quiet ride. When that ride starts to feel harsh, bouncy, or noisy, worn suspension struts are a likely cause. Over time, the hydraulic fluid inside the shock absorber part of the strut breaks down, and it can no longer effectively control the vehicle's movement. This is a normal wear-and-tear item, with many struts needing replacement between 50,000 and 100,000 miles, depending on driving conditions.
Signs of Failing Struts on Your RX350
Pay attention to these common symptoms. Addressing them early can prevent further suspension damage and unsafe driving conditions.
🎬 Watch this overview of common Lexus suspension and stability issues.- Bouncy or Rough Ride: The most common symptom. Your RX350 will feel less stable and you'll notice more bouncing after hitting bumps.
- Nose-Diving: When you apply the brakes, the front of the vehicle dips down excessively.
- Clunking or Knocking Noises: You may hear a heavy clunking sound from a corner of the vehicle when driving over bumps or uneven roads.
- Swaying or Body Roll: The vehicle may feel like it's leaning too much during turns.
- Uneven Tire Wear: A failing strut can cause a specific "cupped" wear pattern on your tires.
A Note on Noises
While clunking over bumps often points to struts, some 2016-2019 RX models have a Technical Service Bulletin (TSB L-SB-0030-19) for a squeak from the rear suspension caused by trailing arm bushings, especially in cold weather. Additionally, some owners have reported a rattling noise that sounds like a suspension issue but is actually caused by loose roof rack bolts.
🎬 Check these common noise sources before replacing your shocks.Choosing the Right Aftermarket Strut
When replacing struts, you have a choice between Original Equipment (OEM) from a Lexus dealer and aftermarket parts. For the RX350, you can get excellent results with high-quality aftermarket brands, often at a significant savings.
OEM vs. Aftermarket Quality:
Many Lexus vehicles, including the RX series, use KYB as the manufacturer for their original factory struts. This means you can often buy a KYB-branded strut that is very similar, if not identical, to the part sold at the dealership, but for a lower price. Aftermarket KYB struts are known for sometimes being slightly firmer than the original parts to restore the factory ride characteristics.
Brand Tiers for Your Lexus:
- KYB: Considered a top-tier aftermarket option and an OEM supplier. Choosing KYB struts, especially their "Strut-Plus" complete assemblies, is a reliable way to restore your RX350's original handling and comfort. Forum users widely recommend KYB as the best choice for a near-OEM feel.
- FCS (FCS Struts): A budget-friendly option. These are often sold as complete "quick strut" assemblies, which can save on labor time. While some owners find them to be a good value, others report the ride can be harsher compared to OEM or KYB. They are a viable choice if budget is the primary concern.
Pro Tip: Replace in Pairs
Always replace struts in pairs (both front or both rear) to ensure even handling and stability. Mismatched struts can cause unpredictable steering and braking. Also, a wheel alignment is required after replacing front struts to prevent premature tire wear.
Cost of Replacing Lexus RX350 Struts
| Part Type | Estimated Part Cost (Pair) | Estimated Labor Cost (Pair) |
|---|---|---|
| New OEM (Dealer) | $700 - $2200+ | $409 - $600 |
| New Aftermarket (KYB, FCS) | $198 - $307 | $409 - $600 |
Cost estimates are for parts and labor and can vary based on your location and the specific repair shop. The aftermarket price range is based on the provided inventory. OEM and labor costs are based on general market data.
Frequently Asked Questions
Do I need to replace the springs with the struts?
Not always, but it's often a good idea. The easiest and often most cost-effective solution is to buy a "complete strut assembly" or "quick strut." This includes the strut, spring, mount, and boot all in one unit. It simplifies installation and ensures all components are new. Reusing old springs on a new strut requires a special tool (a spring compressor) and adds labor time.
Are there any recalls on the 2017-2024 RX350 suspension?
My search did not find any specific recalls for suspension struts on the 2017-2024 Lexus RX350. There was a recall for some 2023 models related to the driver's airbag spiral cable and some 2017 models for a vacuum pump related to braking assist, but not the struts themselves.
What is a TSB and are there any for my suspension?
A Technical Service Bulletin (TSB) is a notice from the manufacturer to dealers about a common problem and a recommended fix. For 2016-2019 RX models, TSB L-SB-0030-19 addresses a squeak from the rear suspension that can be mistaken for a strut problem. It's caused by the trailing arm bushings. There is also a TSB for some 2016-2019 models (L-SB-0032-19) that addresses a bucking or surging feeling, but this is related to the engine/transmission control module, not the suspension.
How long does it take to replace struts?
A professional mechanic can typically replace a pair of front or rear struts in about 2 to 3 hours. Using complete strut assemblies can reduce this time significantly.
Helpful Videos
Technical Specifications
This guide covers standard suspension struts. It does not apply to models with the optional Adaptive Variable Suspension (AVS) or F-Sport tuned suspensions, which use different, non-interchangeable parts. AVS struts will have an electrical wire connected to the top.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Lexus RX350: