Parts for your 2017 Subaru Outback-Control arms

2017 Subaru Outback Control Arms — What They Do and When to Replace

Control arms are absolutely fitted to the 2017 Subaru Outback. Technical references including the Subaru Factory Service Manual (2015–2019 Outback/Legacy, Suspension section), the Subaru global parts catalogue (front lower control arm assemblies and associated bushes/ball joint), and common trade databases (Mitchell1/ALLDATA suspension layouts) all list a front MacPherson strut with a lower control arm, and a rear multi-link/double-wishbone arrangement using links and arms. So, control arms are very much relevant to this model.

On the 2017 Outback, the front suspension uses a lower control arm to locate the wheel hub and manage camber and caster as the strut moves. The arm pivots on chassis-mounted rubber (often hydro-filled) bushes at the rear and front pivots, and it attaches to the steering knuckle via a ball joint. At the rear, the multi-link setup uses arms and links to keep the wheel planted and stable. Together, these components keep steering direct, ride settled, and tyre wear tidy.

As part of routine servicing, control arms and their bushes deserve a close look every 10,000–15,000 km or at each service. Many BS/BN-platform Outbacks develop wear in the front rear bush, which can show as a weep of fluid on hydro-bushed arms, cracking, or separation. The ball joint should be checked for play and split boots. A road test for clunks over speed humps, vibration on braking, or tramlining helps confirm issues.

• Tell-tales: uneven tyre wear, steering shimmy, knocking over bumps, vague on‑centre feel, or pulling under brakes.
• Good practice: replace arms or bushes in axle pairs, torque pivots at normal ride height, and carry out a four‑wheel alignment afterwards.
• Repair options: press in quality bushes if the arm is sound, or fit a complete arm assembly (often quicker and cost‑effective). Always use new pinch bolts at the ball joint if specified by Subaru.

Owners can expect long life from quality OEM or reputable aftermarket arms, especially with fresh bushes and correct torqueing. After replacement, an alignment will restore straight‑line stability and protect the tyres. For vehicles doing lots of rough Kiwi or Aussie roads, more frequent inspections keep the Outback feeling tight and sure‑footed.

Popular questions about 2017 Subaru Outback control arms

How long do control arm bushes last on a 2017 Outback?
Many see 80,000–150,000 km, but road conditions and loads make a big difference. Hydro-bushed front arms can age sooner if exposed to heat or rough surfaces, showing fluid seepage or cracking. Regular checks during servicing spot issues early.

Can the bushes be replaced, or is a full arm needed?
Both paths are common. If the arm is straight and the ball joint is healthy, pressing in new bushes is cost‑effective. If the ball joint or arm is worn, or labour access is tight, a complete arm assembly can save time and deliver a like‑new result.

Is a wheel alignment required after replacing control arms?
Yes. Changing arms or bushes alters suspension geometry. A four‑wheel alignment sets camber, caster (where adjustable), and toe to protect tyres and keep the Outback tracking straight.