Parts for your 2017 Subaru Impreza-Ball joints

2017 Subaru Impreza ball-joints — what they do and when to replace

Based on technical references, ball joints are fitted to the 2017 Subaru Impreza. The Subaru Service Manual for 2017MY Impreza (GK/GT) details a MacPherson strut front suspension with a lower control arm and a separable front lower ball joint clamped into the steering knuckle. Subaru’s OEM parts catalogues list front lower ball joints for this model, and major aftermarket catalogues (such as MOOG and Mevotech) also specify direct-replacement ball joints for the 2017 Impreza. General workshop manuals (e.g., Haynes/Gregory’s) outline inspection and replacement procedures for these joints on this platform.

On the 2017 Impreza, the front lower ball joint is the pivot that lets the front hub steer left-right while the suspension moves up-down. It keeps the wheel hub located while allowing smooth articulation, which is critical for precise steering feel, even tyre wear and good braking stability. As a sealed part, it doesn’t need greasing, but it does need periodic checks so any wear is caught early.

During regular servicing, a good workshop will inspect the ball joints for split or weeping boots, rust staining, play and noise. Typical signs of a tired ball joint include a clunk over bumps, vague or wandering steering, shimmy under braking and uneven tyre wear. Anyone driving in Aussie heat, NZ coastal air or on coarse-chip roads might see faster wear thanks to dust, water and salt.

• Service tips: request a front-end check every 10,000–15,000 km, keep an eye on boot condition, wash road grime and salt from suspension after beach trips.
• Road test clues: clunks at low speed over bumps, knock when turning into driveways, or a twitchy feel at highway speed.
• Workshop checks: lever test at the control arm/knuckle, and wheel play test at 12 and 6 o’clock with the vehicle safely lifted.

If replacement is needed, quality matters. Choose reputable OEM-equivalent parts. The joint is secured by a pinch-bolt at the knuckle, that bolt and any split pins should be renewed, and factory torque specs followed. It’s smart to replace in axle pairs if mileage is high. After fitting, a wheel alignment is recommended to keep steering straight and tyres happy. Driving on a severely worn ball joint is risky — in the worst case, separation can occur — so prompt attention is worth it for safety and for preserving tyres and struts.

Popular questions

How long do ball joints last on a 2017 Subaru Impreza?
Many see 100,000–150,000 km or more, but life varies with road conditions, driving style and exposure to dust or coastal air. Regular inspections during routine servicing help catch wear before it affects tyres or safety.

If the boots split or there’s any play/noise, replacement is the go. Leaving it too long can accelerate tyre wear and stress other suspension bits.

Do you need a wheel alignment after replacing ball joints?
Yes, an alignment is recommended. Even though the ball joint itself isn’t an adjustment point, removal and refit of suspension parts can nudge geometry. A fresh alignment keeps the steering centred and protects the tyres.

What symptoms point to a failing ball joint?
Common giveaways include a dull clunk over bumps, vague steering, tramlining, or uneven tyre wear. A technician may also spot split boots or rust staining around the joint.

Any of these signs are worth investigating quickly, a small amount of play can turn into a big repair bill if it’s ignored.