Lexus RX Front Suspension Strut: Specs, Fitment & Common Faults

A genuinely honest, UK-based account, documented as "Lexus Admits Front Suspension Noise": a dealer took nearly three months without resolving a knock noticed immediately after purchase — plus an alarming discovery of a missing cotter pin during an unrelated overnight test drive.

Illustration of a suspension strut and coil spring

Illustration for editorial purposes

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OEM Part Number: confirm via VIN — front struts (aftermarket) KYB 3340264 / Sachs 317 149

Accuracy note: Covers the Lexus RX (2015-) as listed in the UK aftermarket catalogues. Front struts, lower arms and top mounts are sold by side and by suspension spec — standard, sport / lowered (S line, M Sport, R-Line, ST-Line etc.), heavy-duty and adaptive / electronic damping all use different part numbers, and some makers split by engine or front axle load. The references below are UK aftermarket catalogue listings for this generation, labelled by brand; genuine numbers are shown only where a listing quotes one. Confirm the fit against your VIN, and replace struts and top mounts in pairs.

Front strut / shock absorber (aftermarket)	KYB 3340264 (Excel-G twin-tube gas, LH); KYB 3340263 (RH); KYB 3340228 (LH) and 3340227 (RH) (Excel-G twin-tube gas); Sachs 317 149 (twin-tube gas, LH); Sachs 317 150 (RH); NTY A-TY-093 (LH) and A-TY-092 (RH) (electronically adjustable damping)
Front lower arm / wishbone (aftermarket)	LH NTY ZWD-TY-166; RH NTY ZWD-TY-167; LH Delphi TC7568; RH Delphi TC7567 (445 mm, with ball joint); LH Maxgear 72-6145; RH Maxgear 72-6146; RH Herth+Buss Jakoparts J4912080
Top mount / strut bearing (aftermarket)	NTY AD-TY-085 (top strut mount); Maxgear 72-3551 (repair kit with ball bearing); Maxgear 72-4241 (bearing); GSP 513638 (top mount); KYB SM5423 (mounting kit); Sidem 845405 (35.2 mm inner, 70 mm outer bearing)
Genuine (OE) numbers quoted	None quoted in catalogue listings — order genuine parts against your VIN
Fitment notes	Standard twin-tube struts from KYB and Sachs, with an NTY electronically adjustable (adaptive) option; the Sachs 317 149/150 pair is the same reference listed for the CT.

Lexus RX Front Suspension Strut: The System That Quietly Does All the Work

On the Lexus RX, these components absorb every pothole, bump and cornering force before any of it reaches the cabin, which is why deterioration here rarely announces itself with one obvious symptom. Working through it methodically finds the actual cause faster than guessing ever will.

Before you buy: suspension components vary by trim, engine weight and whether your car has the standard or sport-tuned setup. Always confirm against your VIN before ordering.

Lexus RX Front Suspension Strut: What It Does

The Lexus RX's front strut does two jobs in one unit — damping the suspension's movement and providing the coil spring's mounting point. Wear here shows up as excessive bounce after bumps rather than a quick settle, and left long enough, uneven tyre wear tends to follow.

Lexus RX Front Suspension Strut: Watch: Replacing It

🎬 Watch: 2010-2015 Lexus RX350 RX450h Front Strut/Shock Assembly Replacement Instructions (older gen)

Watch on YouTube ↗

Third-gen RX (AL10); no 2015+ AL20 front strut video surfaced

Lexus RX Front Suspension reference plate

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A Genuinely Honest, UK-Based Real Account Worth Knowing — Lexus RX Front Suspension

If you're facing a knocking noise from the front suspension, this is genuinely worth knowing: one documented UK case, discussed under the thread title "Lexus Admits Front Suspension Noise," described noticing exactly this knocking noise over small bumps and potholes at low speed immediately after buying the car, with the dealer taking nearly three months without properly resolving it. It's genuinely worth knowing this issue has been documented and discussed at length by UK owners, worth referencing similar documented cases if a dealer seems slow to properly investigate a similar noise.

A genuinely specific, honest finding worth knowing about a commonly overlooked cause: one documented case saw almost everything in the front end replaced, including the ball joints, with the knocking noise persisting throughout — only for it to finally disappear once the sway bar links specifically were replaced. It's genuinely worth checking these specifically even after replacing more commonly suspected components, since a worn sway bar link can be easy to overlook.

It's also genuinely worth knowing a genuinely alarming, honest account worth being aware of: one documented case saw a car left with a dealer for an entirely unrelated hesitation issue, with the mechanics happening to drive it overnight as part of their investigation and noticing excessive front suspension noise — this led to discovering a missing cotter pin, a loose ball joint, and a loose bolt securing the bottom of the strut to the lower control arm, none of which had been the original complaint. It's worth knowing this kind of genuinely dangerous, loose fastener issue can develop without obvious warning, and worth having a full suspension check done periodically rather than only investigating when a specific noise prompts it. On air suspension-equipped variants specifically, it's also worth knowing that front suspension noise often stems from a genuinely different cause entirely — worn air springs or a failing air compressor — rather than the conventional strut and ball joint issues discussed above.

Lexus RX Front Suspension Strut: Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Front Suspension Strut Guide for symptoms of worn bushings and ball joints, confirming fitment against your VIN, and rubber vs polyurethane guidance.

More Lexus Front Suspension Strut

The same part, covered across other Lexus models.