A Guide to the Wheel Bearing and Hub Assembly for the 2016-2024 Subaru Outback
If you're hearing a persistent humming or grinding noise from a wheel, it's a common sign that your Outback needs a new wheel bearing hub.
- Wheel bearing failure is a very common problem for the 2016-2024 Subaru Outback, often indicated by a loud humming noise.
- Subaru has issued TSBs acknowledging design flaws in the rear hubs related to water intrusion, making aftermarket parts a smart choice.
- For longevity, choose premium aftermarket brands like SKF or Timken, which are often considered better than the OEM parts.
- Replacement can be difficult due to the hub seizing in the knuckle; what seems like a simple bolt-on job can require heavy-duty tools and extra labor.
Is Your Subaru Outback Making a Loud Humming Noise?
A loud, constant humming or growling noise coming from one corner of your car that gets louder with speed is the 🎬 Watch this video to 100% diagnose a bad wheel bearing. number one symptom of a bad wheel bearing. Many Subaru Outback owners from the 2016 to 2024 model years report this issue, sometimes with relatively low mileage. The noise often changes when you turn; for example, a bad right-front bearing may get louder when you steer left, which puts more load on it.
Common Failure Symptoms
- Humming, Rumbling, or Growling Noise: A noise that increases in pitch and volume with vehicle speed.
- Vibration: A vibration felt in the steering wheel or through the floor, which can be caused by excessive play in the bearing.
- Steering Feels Loose: The steering may feel less precise or wander slightly because of play in a worn hub assembly.
- Clicking Sounds: A clicking or snapping sound when turning can also indicate a worn bearing.
Known Issues: TSBs and Premature Wear
Subaru wheel bearings are a known weak point. Subaru has issued Technical Service Bulletins (TSBs) related to this part. TSB 03-96-25 notes that rear wheel hubs on 2015-2024 models can fail due to water getting past the seals, causing corrosion and noise. Another TSB (MC-10185064-0001) points out that an uneven rear brake backing plate can damage the bearing over time, requiring both parts to be replaced as a set. Because of these known issues with original parts, choosing a high-quality aftermarket replacement is often a better investment than using another OEM bearing.
Choosing the Right Aftermarket Hub Assembly
Not all aftermarket parts are created equal. For a critical component like a wheel hub, quality determines how long the part will last. Here’s a breakdown of available brands.
Brand Quality Tiers
- Premium Aftermarket (Recommended): SKF, Timken
These brands are highly regarded and are often original equipment suppliers for many car manufacturers. Forum users and mechanics consistently recommend Timken and SKF for their durability and quality, often considering them an upgrade over the stock Subaru part. If you want a reliable, long-lasting repair, these are your best choices. - Standard Aftermarket: Moog
Moog was once considered a top-tier brand, but its reputation has become mixed in recent years. While still a decent option for a daily driver, it is no longer in the same premium category as SKF or Timken. It can be a good balance of price and performance if premium brands are not available. - Economy Aftermarket: Dorman, IAP Hub Assembly, MPA
These brands offer a value-oriented repair. Dorman provides a wide range of OE-style replacement parts that fit and function correctly. Brands like IAP and MPA fall into a similar category. They are a cost-effective solution, but may not offer the same long-term durability as premium brands.
Cost of Replacing a Subaru Outback Wheel Hub Assembly
The total cost depends on the parts you choose and who does the work. The job can be difficult because the hub often rusts and seizes into the steering knuckle, making it hard to remove.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Hub Assembly | $94 - $197 (per wheel) |
| New OEM Hub Assembly | $250 - $400 (per wheel) |
| Shop Labor | $150 - $350 (per wheel) |
| Total (Shop Repair, Aftermarket Part) | $244 - $547 (per wheel) |
Cost estimates are for one wheel and can vary by location and the specific condition of the vehicle.
Pro Tip: Replace in Pairs?
While not strictly required, it's often a good idea to replace wheel bearings in pairs on the same axle (both fronts or both rears). They are subjected to the same conditions, so if one has failed, the other may not be far behind. This can save you from having to do the same repair again in the near future.
Frequently Asked Questions
Can I perform this replacement myself?
This is a challenging job for a DIY mechanic. While it involves unbolting the old hub and bolting on the new one, the old hub often seizes to the knuckle, especially in areas with road salt. Removing it can require special tools like a hub puller or slide hammer, a sledgehammer, and sometimes heat. If you are an experienced mechanic with the right tools, it is feasible. Otherwise, it's best left to a professional.
Why do Subaru Outback wheel bearings seem to fail more often?
It's a widely discussed topic among owners. Evidence from TSBs suggests that the original seals on some model years were not robust enough to prevent water and debris from getting into the bearing, causing it to fail prematurely. The design of the rear suspension and backing plates may also contribute to the issue.
What happens if I don't replace a bad wheel bearing?
The noise and vibration will get progressively worse. A worn bearing creates excess heat and play in the wheel, which can damage the hub, axle, and surrounding suspension components. In a worst-case scenario, the wheel could separate from the vehicle, leading to a complete loss of control. It is a serious safety issue that should be addressed promptly.
Should I use an impact wrench on the new axle nut?
No. You should never use an impact wrench to tighten the axle nut. Doing so can easily over-torque it, which puts excessive preload on the new bearing and can cause it to fail very quickly. The nut should be tightened with a torque wrench to the manufacturer's specification, which is typically around 162 ft-lbs 🎬 See this walkthrough for replacing front wheel bearing assemblies. for the front axle.
Helpful Videos
Technical Specifications
OEM Part Numbers: 28473FL040
This is a bolt-on wheel bearing and hub assembly. The front axle nut torque is critical and should be set to 162 ft-lbs. The rear axle nut torque is 174 ft-lbs. The rear assembly includes an electronic parking brake connection.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Subaru Outback:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Subaru Outback Making a Loud Humming Noise?
- Common Failure Symptoms
- Known Issues: TSBs and Premature Wear
- Choosing the Right Aftermarket Hub Assembly
- Brand Quality Tiers
- Cost of Replacing a Subaru Outback Wheel Hub Assembly
- Pro Tip: Replace in Pairs?
- Frequently Asked Questions
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