Subaru Outback Front Suspension Strut: Specs, Fitment & Common Faults

A genuinely significant, real finding: a persistent knock survived four dealer visits over almost a year before being resolved by replacing the rack and pinion — and the dealer's own replacement loaner car had the exact same issue.

Illustration for editorial purposes

OEM Part Number: 20310AE150 (front strut, as quoted in catalogue listings — confirm via VIN) — aftermarket struts Bilstein 22-278593 / Monroe 16483

Subaru Outback Front Suspension Strut: The System That Quietly Does All the Work

On the Subaru Outback, every bump, pothole and corner passes through these components before you ever feel it in the cabin, which is exactly why wear here shows up as vague, hard-to-pin-down symptoms rather than one obvious failure. A methodical check usually finds the culprit faster than guesswork.

Subaru Outback Front Suspension Strut: What It Does

The Subaru Outback's front suspension strut combines a shock absorber with the coil spring mounting point in one assembly, controlling how quickly the suspension compresses and rebounds over bumps. A worn strut lets the car bounce excessively after a bump instead of settling quickly, and can accelerate uneven tyre wear if left unaddressed.

Subaru Outback Front Suspension Strut: Watch: Replacing It

BS-gen year; alt qa4LoQ3KWmk (2016 Outback front struts and sway bar end links)

A Genuinely Significant, Real Finding Worth Knowing About a Persistent Knock — Subaru Outback Front Suspension

If you're facing a front knock that survives multiple dealer visits and repair attempts, this is genuinely worth knowing: one documented case saw a persistent front knock survive four separate dealer visits over almost a year, with the dealer unable to identify the cause each time, before finally being resolved by replacing the rack and pinion — a component not always considered a typical suspect for a knock like this. Genuinely significant: the dealer's own replacement loaner car, a different, near-new Forester with only a few thousand kilometres on it, was found to have the exact same issue, strongly suggesting this reflects a genuine, wider quality concern with this specific part rather than an isolated fault on one individual car. If a persistent knock has already ruled out the more commonly suspected strut and bushing components, it's genuinely worth asking specifically about the rack and pinion.

It's also genuinely worth knowing a useful diagnostic distinction: a knock that appears specifically when hitting a bump at an angle, such as entering a raised driveway diagonally, but not when driving straight over the same bump, can point toward something in the steering or sway bar system rather than a purely vertical-motion component like the strut itself — worth mentioning this specific pattern when describing the fault to whoever is diagnosing it.

Subaru Outback Front Suspension Strut: Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Front Suspension Strut Guide for symptoms of worn bushings and ball joints, confirming fitment against your VIN, and rubber vs polyurethane guidance.

More Subaru Front Suspension Strut

The same part, covered across other Subaru models.

• Subaru Crosstrek Front Suspension Strut
• Subaru Forester Front Suspension Strut
• Subaru Impreza Front Suspension Strut