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Parts for your 2018 Toyota Mark x-Steering rack
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2018 Toyota Mark X steering rack — what it does and when to service it
Technical sources confirm the 2018 Toyota Mark X is fitted with a rack-and-pinion steering rack. Toyota’s GRX13# Repair Manual (Steering – Electric Power Steering), Toyota Global model literature for the 2016-on facelift, and the Mark X GRMN technical notes all describe an electric power steering (EPS) rack-and-pinion setup. So yes, a steering rack is absolutely relevant on this model.
On the 2018 Mark X, the steering rack turns the driver’s input at the wheel into precise side-to-side movement of the tie rods, pointing the front wheels exactly where they need to go. The EPS motor is integrated with the rack housing, so assist is smooth and doesn’t sap engine power. That means crisper feel around town, direct response on the motorway, and fewer moving bits than older hydraulic systems.
As part of routine servicing, the steering rack deserves a quick once-over every 10,000–15,000 km. There’s no power-steering fluid to change on the EPS-equipped Mark X, but there’s still plenty to check:
- Rack boots: look for tears, oil/grease contamination, or moisture ingress.
- Inner and outer tie rods: check for play and split dust boots.
- Rack mounting bushes and subframe fasteners: confirm they’re snug and not perished.
- Wheel alignment: correct toe keeps the rack happy and tyres wearing evenly.
Signs the rack or related bits need attention include clunks over bumps, on‑centre wander, notchy or heavy steering, uneven tyre wear, a crooked steering wheel after a bump, or an EPS warning light. Left unattended, play in the rack or tie rods can become a safety issue and may risk a WOF/RWC fail.
When replacement is needed, most workshops will fit a complete EPS rack assembly. Expect to perform a wheel alignment and carry out EPS/steering angle calibrations using Toyota Techstream or a capable scan tool (neutral position/zero‑point learn). It’s smart to renew inner/outer tie rods and rack boots at the same time. If going for a reconditioned unit, choose one with new seals, bushes and end bearings, and insist on bench‑tested output. Always torque subframe and rack hardware to Toyota specs.
Driving habits help too: keep tyres inflated and balanced, avoid whacking kerbs, and get alignment checked after big pothole hits. Look after the rack and the Mark X will reward with that tidy, confident steering feel it’s known for.
Popular question: Does the 2018 Mark X use electric or hydraulic power steering?
It uses electric power steering (EPS) built into a rack‑and‑pinion steering rack. There’s no hydraulic pump or power‑steering fluid to service, which trims maintenance and frees up a bit of engine power.
Popular question: How long should a steering rack last on a 2018 Mark X?
With normal use, it can run well past 150,000–200,000 km. Keep the rack boots intact, maintain alignment, and replace worn tie rods promptly to protect the rack. If you notice play, clunks, or an EPS warning, get it checked early.
Popular question: Can just the inner tie rods be replaced, or does the whole rack need doing?
Inner tie rods are serviceable on their own and often fix play or feathered tyre wear. If the rack has internal wear, excessive backlash, or EPS faults, a complete rack assembly is the better fix.
