Parts for your 2018 Lexus Is-Ball joints

2018 Lexus IS ball joints — what they do and when to sort them out

Based on Lexus technical sources, ball joints are definitely used on the 2018 Lexus IS (XE30). The Lexus New Car Features manual for the IS details a double-wishbone front suspension, and the factory Repair Manual includes procedures titled “Front Lower Ball Joint – Removal/Installation.” The Lexus/Toyota Electronic Parts Catalogue also lists a front lower ball joint and an upper control arm that incorporates an upper ball joint. So yes — ball joints are relevant to this model.

On the 2018 Lexus IS, ball joints link the steering knuckle to the control arms, letting the front wheels turn and move up and down while keeping everything located correctly. They carry vehicle load, maintain alignment, and help the IS track straight and feel precise through corners. When they wear, steering feel goes off, tyres scrub, and bumps can sound clunky — not ideal for a car built for sharp handling.

They’re sealed components, so there’s no greasing at service time, but inspection is important. A good workshop will check for play, torn dust boots, and any dry or rusty movement at each service interval. If a boot splits, water and grit get in, accelerating wear. The lower ball joint on the IS is a separate part, the upper ball joint is integrated into the upper control arm, so that arm is replaced as an assembly if it’s worn.

• Typical signs it’s time: a knock over speed humps, steering wander on the motorway, uneven or rapid tyre wear, and vibration through the wheel.
• Road test and a 12-and-6 o’clock wheel shake on a hoist will usually reveal play, any measurable movement is grounds for replacement.

• Best practice: replace in axle pairs if wear is evident on one side, use quality OE-equivalent parts, torque fasteners with the suspension at ride height, and book a wheel alignment straight after.
• Longevity varies with roads and driving style, but many last well beyond 100,000 km. Regular checks (every service or at least every 10,000–15,000 km) keep surprises at bay.

Left too long, a failing ball joint can affect braking stability and steering safety. Sorting them promptly restores that planted, confidence-inspiring feel the IS is known for — and it’s kinder on tyres and your wallet.

FAQs

Does the 2018 Lexus IS have ball joints?
Yes. Factory documentation for the XE30 platform confirms a double-wishbone front end with a serviceable lower ball joint and an upper control arm that contains the upper ball joint.

How often should ball joints be replaced on a 2018 IS?
There’s no fixed kilometre interval. Inspect them at every service, replace when there’s play, noise, or damaged boots. Many last 100,000–200,000 km depending on conditions.

Do I need a wheel alignment after replacing ball joints?
Absolutely. Any ball joint or control arm work alters alignment. An immediate alignment protects tyres and restores the steering feel the IS is designed to deliver.