Parts for your 2006 Subaru Impreza-Wheel hubs

2006 Subaru Impreza Wheel Hubs — What They Do and When to Replace

Based on the Subaru Factory Service Manual for MY2006 Impreza (Axle/Hub and Bearing sections) and OEM parts catalogues used by dealers and aftermarket suppliers, the 2006 Subaru Impreza is fitted with wheel hubs on both front and rear. The front typically uses a hub/bearing unit bolted to the knuckle, while the rear uses a separate hub with a press-in bearing on many trims. That makes wheel hubs absolutely relevant for this model.

The wheel hub is the sturdy central piece that the wheel bolts to. On the Impreza’s AWD layout, the hub is splined to the drive shaft, supports the brake rotor, and holds the wheel bearing that lets the wheel spin smoothly. It also interfaces with the ABS tone ring or encoder, so a tired hub/bearing can trigger ABS faults as well as noise.

There’s no fixed service interval for hubs, they’re replaced when worn. Common symptoms include a humming or growling that rises with road speed, play when rocking the wheel at 12 and 6 o’clock, ABS lights from damaged encoder rings, and uneven rotor or pad wear. Drivers in Australia and New Zealand who encounter frequent rain, corrugations, or coastal roads may see wear appear sooner.

• Inspection tips: Check for roughness when spinning the wheel off the ground, listen for droning that changes when loading the corner, and feel for heat after a drive (with care).
• Replacement guidance: Front hub units are typically bolt-on, rears often require a press to service the bearing and hub in the knuckle. Always torque the axle nut to factory spec and stake a new nut.
• Best practice: Renew seals, snap rings (rear), and hub bolts as needed, clean mating faces, set ABS sensor clearance, and avoid pressing through the bearing without proper support.

Quality matters. Reputable bearings and hub units (the kind Subaru specifies from OEM-tier makers) will reduce noise, last longer, and resist water ingress. After installation, a road test on varying speeds helps confirm the fix. No wheel alignment is normally needed for front hub units, but if rear suspension arms were disturbed, it’s smart to check alignment and tyre wear.

Look after the hubs by rinsing off road grime, avoiding direct high-pressure washing at the seals, and rechecking wheel fastener torque after a few hundred kilometres. Treated right, the Impreza’s hubs will handle the daily commute and the odd winding B-road without complaint.

• How can someone tell if a 2006 Impreza wheel hub or bearing is failing?

  Most owners notice a low-speed rumble that turns into a steady drone as speed climbs. The sound often gets louder when gently steering to load the suspect corner. There may also be play when the wheel is rocked at 12 and 6 o’clock, or an ABS light if the encoder ring is compromised.

  On a hoist, a rough, notchy feel when spinning the wheel by hand is another giveaway. Tyre noise can mimic a hub, so cross-rotating tyres is a quick way to rule that out.

• Can a home mechanic replace the hubs on a 2006 Impreza?

  Yes, with the right tools. The front hub unit is generally bolt-on and manageable with sockets, a breaker bar, and a torque wrench. The rear often needs a press or a quality hub puller and proper bearing support tools to avoid damage.

  If a press isn’t available, many choose a professional for the rear. Either way, use new seals and hardware where specified and torque the axle nut correctly.

• Are WRX/STI hubs different from non-turbo models?

  There are specification differences across trims and brakes, including bearing type, ABS encoder style, and hub dimensions. WRX and STI variants can have heavier-duty components. Parts should always be selected by VIN or build code to ensure the correct hub and bearing combination.