Parts for your 2018 Lexus Is-Steering rack

2018 Lexus IS steering rack — what it does and how to look after it

Yes, the 2018 Lexus IS uses a steering rack. Lexus technical literature confirms the XE30-series IS (including IS 300, IS 300h and IS 350) runs an electric power steering, rack-and-pinion setup. This is detailed in Lexus New Car Features for the IS (Electric Power Steering — rack-and-pinion type), the 2018 IS Repair Manual sections for Power Steering (EPS) and Steering Gear, and Toyota/Lexus Electronic Parts Catalogue listings for the steering gear assembly across ASE30/AVE30/GSE3x models.

On this model, the steering rack is the heart of the front-end directional control. The steering wheel’s movement travels through the column to the electric-assisted rack-and-pinion gear, translating rotation into side-to-side motion that sets toe angle via the inner and outer tie rods. Because it’s EPS, assistance is supplied by an electric motor and control module on the rack, not hydraulic fluid — so there’s no power-steering pump, reservoir or hoses to service.

For servicing, the rack itself is largely maintenance-free, but the bits around it aren’t. Bellows boots should be checked for splits, clamps for security, and inner/outer tie rod joints for play. If a tie rod is worn, replace it and carry out a wheel alignment straight after. Any impact damage (potholes, kerbs) can bend a tie rod or mark the rack bar, so an inspection after a big hit is smart, especially if the steering no longer centres cleanly.

Replacement of the steering rack is generally only needed if there’s excessive internal play, harsh notches through the wheel, binding, water ingress, or electronic faults in the EPS motor/sensor assembly. When a rack is replaced on a 2018 IS, the job should include: new rack-to-subframe bolts (where specified), reusing or replacing tie rods as needed, resetting the steering angle sensor, and running the EPS calibration/initialisation with a suitable scan tool. Expect to finish with a precise alignment and a road test on a smooth, straight section to verify on-centre feel.

Tell-tale signs to book it in:

• Knock or clunk over bumps that tracks with steering input
• Play or vagueness around centre, or uneven tyre wear
• Steering warning lamp, heavy or intermittent assist, or pull after an impact

Look after the front-end — keep tyres matched and correctly inflated, avoid kerb strikes, and get alignments checked every 20,000–30,000 km — and the IS rack typically delivers long, silky service.

Does the 2018 Lexus IS use electric or hydraulic power steering?

It uses electric power steering (EPS) with a rack-and-pinion gear. There’s no hydraulic pump or fluid, which trims weight and maintenance while allowing fine-tuned assist and lane-keeping integration where fitted.

How long should a steering rack last on a 2018 IS?

With clean boots, healthy tie rods and correct alignment, many see well over 150,000–250,000 km. Impacts, water intrusion, or running with worn joints can shorten that. Regular inspections during scheduled services help catch issues early.

What’s involved in replacing the rack on this model?

The rack is removed from the front subframe, tie rods are transferred or renewed, and new hardware used where specified. After fitting, a wheel alignment plus EPS initialisation and steering angle sensor reset with a scan tool are required to restore proper assist and on-centre feel.