Lexus IS Front Suspension Strut: Specs, Fitment & Common Faults
A genuinely specific, honest finding: almost everything in the front end was replaced with the clunk persisting, only for it to finally disappear once the sway bar links specifically were replaced — plus an alarming discovery of a missing cotter pin found by chance.
Illustration for editorial purposes
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OEM Part Number: 4852059275 (front strut, as quoted in catalogue listings — confirm via VIN) — aftermarket struts KYB 551131 / Ridex 854S2043
| Front strut / shock absorber (aftermarket) | KYB 551131 (Gas-A-Just monotube gas, LH); KYB 551130 (Gas-A-Just monotube gas, RH); Daco 452101L (monotube gas, LH); Daco 452101R (monotube gas, RH); Maxgear 11-1031 (monotube gas, LH); Ridex 854S2043 (monotube gas, LH) |
|---|---|
| Front lower arm / wishbone (aftermarket) | LH Master-Sport 20750J-PCS-MS (lower, ball joint not stated); Only one lower arm brand is listed for this model. |
| Top mount / strut bearing (aftermarket) | Sachs 802 617 (repair kit, 2 per axle); GSP 514237 (top strut mount, left and right); KYB SM5490 (top mount); KYB SM5423 and SM5639 (mounting kits); febi bilstein 183629 (plastic bearing); Ridex 1180S0328 |
| Genuine (OE) numbers quoted | Toyota/Lexus 4852059275 (LH front strut, Ashika MA-22007, Japanparts MM-22007, Japko MJ22007); 4851080256 (RH front strut, Ashika MA-22008, Japanparts MM-22008); 48680-22020 (top mount, GSP 514237); 48609-04020 and 48609-60100 (Sachs 802 617) |
| Fitment notes | Standard dampers only |
Lexus IS Front Suspension Strut: The System That Quietly Does All the Work
Before you feel a single bump or pothole in the Lexus IS's cabin, it's already passed through these parts — which is exactly why wear tends to present as several vague, overlapping symptoms rather than one clear-cut fault. A methodical check outperforms guesswork here.
Lexus IS Front Suspension Strut: What It Does
The Lexus IS's front suspension combines the shock absorber and spring mount into a single strut assembly, which is what governs how the car settles after a bump. A worn one lets that bounce continue longer than it should, and it can wear tyres unevenly if ignored.
Lexus IS Front Suspension Strut: Watch: Replacing It
Third-gen (XE30) IS front shock job
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A Genuinely Specific, Honest Real Finding Worth Knowing — Lexus IS Front Suspension
If you're facing a persistent knocking noise from the front suspension, this is genuinely worth knowing: one documented case saw almost everything in the front end replaced, including new struts and lower ball joints, with the clunking 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.
It's also genuinely worth knowing that a missing or damaged caliper boot has been documented as another cause of a persistent clunk, worth checking this specifically during any brake work, since a shop without the correct replacement part in stock may simply leave it off rather than sourcing one properly.
Lexus IS 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.