Parts for your 2017 Lexus Is-Control arms

2017 Lexus IS Control Arms: What They Do and When to Service Them

Control arms are absolutely used on the 2017 Lexus IS (XE30 series, including IS200t/IS300/IS350). Lexus’ Technical Information System (TIS) repair manual and the Toyota Electronic Parts Catalogue list front upper and lower control arms for the double-wishbone front suspension, along with multiple rear suspension arms in the multi-link rear setup. Those factory sources confirm the vehicle is built around control arms to locate the wheels, manage alignment angles and keep the ride refined.

On this model, the control arms connect the chassis to the steering knuckle or hub carrier via bushings and ball joints. They let the wheels move up and down over bumps while holding camber and caster in check, which is why the IS feels planted through corners and stays quiet over rough stuff. The bushes soak up vibration and the ball joints allow smooth articulation, so the car tracks straight, brakes cleanly and doesn’t chew through tyres.

There’s no set replacement interval, but they’re wear items. As part of routine servicing, it pays to have a technician check the control arm bushes and ball joints for play, perishing, or torn dust boots, and to look for uneven tyre wear. City kerbs, potholes and spirited driving can all hurry wear along. If a bush or joint is flogged out, the arm or the individual component can often be replaced, depending on the specific arm design and parts availability.

When replacement is on the cards, use quality arms or OE-equivalent bushes and always get a wheel alignment afterwards—changing arms can shift camber and caster. It’s smart practice to tighten bushing bolts at normal ride height to avoid preloading the rubber, and to support the hub so brake hoses and ABS leads aren’t stressed. If the car has developed a steering shimmy, a clunk on take-off or braking, or pulls under brakes, fresh arms and an alignment can restore that crisp Lexus feel.

• Common signs of wear: clunks over bumps, vague steering, uneven or rapid tyre wear, instability under braking, and split ball-joint boots.
• Service tip: inspect at each service or every 10,000–15,000 km, and sooner after a big pothole strike.

Popular questions about 2017 Lexus IS control arms

How long do the control arm bushes and ball joints last?
On a well-driven IS, many owners see well over 80,000–150,000 km before major wear shows up. Driving conditions, big potholes and track use can shorten that window. Regular inspections help catch minor play before it turns into tyre wear or braking shimmy.

Do I need a wheel alignment after replacing control arms?
Yes. Any change to arms, bushes or ball joints can alter camber and caster. A proper alignment brings the geometry back to spec, maximising tyre life and restoring the tidy steering feel the IS is known for.

Can I replace just the bushes, or do I need the whole arm?
It depends on the specific arm and parts availability. Some arms accept press-in bushes and separate ball joints, others are supplied as complete assemblies. Many workshops choose complete arms for longevity and time savings, but quality bush-and-joint replacements can be cost-effective if the arm itself is sound.