Parts for your 2017 Ford Focus-Control arms

2017 Ford Focus control arms: what they do and when to replace them

Control arms are absolutely fitted to the 2017 Ford Focus. Ford’s Workshop Manual (WSM) for the 2017 Focus details a MacPherson strut front end that uses lower control arms with a ball joint linking the arm to the steering knuckle (WSM Section 204-01), and the Ford parts catalogue lists complete front lower arms and associated bushes/ball joints for this model. Technical material on Ford’s Control Blade independent rear suspension also confirms multiple lateral/trailing links (functionally “control arms”) are used on the rear of most 2017 Focus variants. Popular service manuals covering 2012–2018 Focus models describe routine inspection and replacement of these arms and their bushings. So yes—control arms are relevant on this car.

On a 2017 Focus, the control arms (and rear suspension links) keep the wheels tracking straight and true while the struts and shocks handle the bumps. Up front, the lower control arm locates the wheel, sets camber and caster geometry, and lets the knuckle pivot on the ball joint when steering. Down the back, the Control Blade setup uses arms/links to maintain alignment and ride stability, especially under braking and cornering. When the rubber bushes or the ball joint wear, owners may notice clunks over bumps, vague steering, tyre feathering or inner-edge wear, and a tendency to tramline on coarse-chip roads common in Aus/NZ.

As part of regular servicing, it’s smart to visually check control arm bushes and ball joints every 20,000–30,000 km or during tyre rotations. Look for torn rubber, cracked bush sleeves, leaking ball-joint boots, or excessive play. Many Focus variants use an arm with an integral ball joint, in practice, workshops often fit a complete arm rather than pressing bushes/ball joints separately to save time and ensure geometry is tight again. Replacement should be done in pairs (left and right), and any arm-to-subframe bolts specified by Ford as single-use should be renewed. Tighten pivot bolts at normal ride height to avoid preloading the new bushes. A wheel alignment is a must afterwards—expect toe and camber to shift slightly even if you’ve only touched the fronts. If the car has rear alignment adjusters, have the rear checked too.

• Watch for knocks, wandering, or uneven tyre wear—classic signs the arms or bushes are tired.
• Use quality arms with OE-style rubber bushes for comfort, or performance bushes if chasing a firmer feel.
• After replacement: torque correctly, then book an alignment and a quick road test on familiar roads.

Popular questions about 2017 Ford Focus control arms

How long do the control arm bushes and ball joints last?
It varies with roads and driving style, but many Focus owners see 80,000–140,000 km before noticeable wear. Frequent city kerb strikes, rough rural lanes, or lowered springs can shorten that. If there’s any clunking, steering shimmy, or uneven tyre wear, have them checked sooner rather than later.

Do you need a wheel alignment after replacing control arms?
Yes. Even if the new arms match the old ones, small tolerance changes will nudge toe and camber. A proper four-wheel alignment brings the Focus back to spec and protects your tyres.

Can you drive with a worn control arm or bush?
Short answer: not recommended. Minor bush wear might just feel a bit floaty, but severe wear can affect braking stability and steering precision. If there’s knocking or it feels nervous at highway speeds, park it and get it sorted.