Parts for your 2016 Lexus Is-Bump stops

2016 Lexus IS bump-stops: fitted, what they do, and when to replace

Based on technical sources—the Lexus/Toyota Repair Manual for the XE30-platform IS and the Toyota Electronic Parts Catalogue (EPC) diagrams—the 2016 Lexus IS is fitted with bump-stops (also called jounce bumpers) front and rear. They’re typically integrated with the dust boots on the strut and shock assemblies, so yes, bump-stops are relevant and used on this model.

On a 2016 Lexus IS, the bump-stop is a dense foam or rubber cushion that steps in right at the end of the suspension’s travel. It prevents metal-to-metal contact when the car hits a big bump or lands hard, shielding the damper, mounts and body structure from nasty impacts. Because modern bump-stops are progressive, they also act like a mini spring, smoothing out harsh hits and helping the IS feel settled and controlled when pushed—especially on F Sport tunes where the damper stroke and stop rate are matched.

Over time, the microcellular polyurethane or rubber used in these parts can harden, crack or crumble. Aussie heat, Kiwi coastal air, and torn dust boots speed that up. When the bump-stops are perished, the car can “bottom out” over speed humps or potholes with a sharp thud, NVH rises, and shocks can cop extra punishment, sometimes leading to leaks. That can flow on to uneven tyre wear and a ride that feels a bit brittle or crashy.

Best practice for owners and workshops:

• Inspect the front strut and rear shock bump-stops whenever the dampers are out, or during suspension checks every 60,000–100,000 km.
• Replace in axle pairs and choose OE-quality parts matched to the exact variant (IS200t/300/350/300h, RWD/AWD, F Sport vs standard), as lengths and rates can differ.
• If the car is lowered, ensure the bump-stop length and material suit the reduced travel—don’t just trim them without guidance, or the IS may ride on the stops.
• After any strut removal, book a wheel alignment to keep steering feel sharp and tyre wear tidy.

Because the front uses MacPherson struts, a spring compressor and correct torque procedures are required—so it’s not a backyard job unless properly equipped. Many techs replace bump-stops and boots proactively when fitting new shocks, the parts are inexpensive compared with the labour to get in there.

Fresh bump-stops keep the Lexus quiet, composed and protected when the road gets rough—small components doing a big job for ride comfort and durability.

Popular questions about 2016 Lexus IS bump-stops

Do all 2016 Lexus IS models have bump-stops?
Yes. Whether it’s an IS200t, IS300, IS350 or IS300h, and whether RWD or AWD (market dependent), the suspension includes bump-stops as part of the strut/shock assemblies. Some aftermarket coilovers supply their own bump-stops, but the function remains the same.

When should the bump-stops be replaced?
Replace them when cracked, crumbling, oil-soaked, or if the car bottoms out with a harsh thud. Many shops renew them whenever shocks/struts are replaced, typically somewhere around 80,000–120,000 km depending on use and climate.

Can worn bump-stops affect a WOF or roadworthy?
They can contribute to a fail or defect if the condition leads to unsafe operation—like severe bottoming or damaged dampers. Rules vary by state and by NZ WOF guidelines, but perished stops and boots are commonly noted during inspections, especially if shock leakage or control issues are present.