Parts for your 2019 Toyota Mark x-Control arms

2019 Toyota Mark X control arms — purpose, care, and when to replace

Control arms are absolutely used on the 2019 Toyota Mark X. Technical sources confirming this include: the Toyota Repair Manual for Mark X (GRX130, 2016–2019) under Suspension (front and rear) which details upper and lower arms and link geometry, the Toyota Electronic Parts Catalogue (EPC) for GRX130 listing Front Upper Arm Assembly, Front Lower Arm Sub-Assembly, Rear Lower Control Arm and Rear Toe Control Arm, and Toyota New Car Features (GRX130) which specifies a front double-wishbone layout and a rear multi-link arrangement. Together these documents verify that the 2019 model is fitted with control arms at both ends.

On a 2019 Mark X, the control arms are the key links that locate each wheel while letting the suspension move smoothly. Up front, the double-wishbone setup uses an upper and a lower arm to control camber and caster through the stroke, keeping the tyre planted and the steering crisp. Down the back, the multi-link system uses several arms — including lower control and toe arms — to manage wheel alignment under acceleration, braking and cornering, all while isolating noise and harshness via rubber or hydraulic bushes.

When they’re healthy, you get straight tracking, even tyre wear and a planted, refined ride. As bushes and ball joints wear, the car can start to wander, knock over bumps or chew out the inner edges of tyres. Because the Mark X is rear-drive and often driven enthusiastically, staying on top of control-arm condition pays dividends in feel and safety.

As part of servicing a 2019 Mark X, it’s smart to inspect the control arms every 10,000–15,000 km or at each service. Look for cracked or oil-soaked bushes, torn dust boots, rust on arms, or any play at the ball joints. Replace worn bushes or the complete arm assembly (many replacement arms come pre-fitted with bushes and ball joints), then book a four-wheel alignment straight after. Torque bushing bolts at normal ride height to avoid preloading the rubber, and use new self-locking nuts where specified. If one side is shot, the other side usually isn’t far behind, so consider doing them in pairs. While you’re there, check sway bar links and strut mounts, as they often age out together.

• Common symptoms of worn control arms:
  • Clunks over speed humps or sharp bumps
  • Steering shimmy or tramlining at motorway speeds
  • Uneven or rapid inner-edge tyre wear
  • Braking instability or vague turn-in
• Service tips for Aussie and Kiwi conditions:
  • Rinse road salt and coastal grime to protect bushes and arms
  • Avoid kerb strikes and deep potholes that can bend arms
  • Recheck alignment after any suspension work or big impacts

FAQs

Does the 2019 Mark X have front and rear control arms?

Yes. The GRX130 Mark X runs a double-wishbone front end with upper and lower control arms, and a multi-link rear with multiple arms including the lower control and toe arms. This layout delivers sharp steering and stable rear-end behaviour.

How often should control arm bushes be replaced?

There’s no fixed interval. Inspect at each service, many last well past 100,000 km, but harsh roads, kerb strikes and age can bring that forward. Replace when cracks, excessive movement or noise show up, and realign the car afterwards.

Can you replace just the bush or do you need the whole arm?

Both options exist. Pressing in quality bushes is cost-effective if the arm is straight and the ball joint is good. Complete arms save time and include fresh bushes (and often a new ball joint), which can be the better bet for higher-mileage cars.