A Complete Guide to the 2011-2016 Audi S4 CV Axle Shaft
Understand the signs of a failing CV axle on your S4 and how to choose the right replacement part.
- A clicking noise when turning is the most common sign of a failing CV axle; it means the joint is already damaged.
- For this vehicle, OEM supplier brands like GKN are highly recommended over budget aftermarket axles to avoid vibrations and ensure durability.
- A torn CV boot is the initial problem; if you see grease on your wheel, inspect the axle immediately to potentially avoid a full replacement.
- DIY replacement is possible but requires special tools like triple square sockets and a high-torque wrench.
Is Your Audi S4 Making a Clicking Noise When You Turn?
A clicking or popping sound when turning is one of the most common signs that a CV axle on your 2011-2016 Audi S4 is failing. This usually happens because the protective rubber boot on the CV joint has torn. When the boot tears, the special grease that lubricates the joint leaks out, and dirt and water get in, quickly causing damage. Catching a torn boot early can sometimes save the axle, but once the clicking starts, the joint is likely already damaged and the entire axle shaft assembly needs to be replaced.
Key Failure Symptoms
- Clicking or Popping Noises: Most noticeable during sharp, slow-speed turns.
- Vibrations: A shaking feeling during acceleration that can be felt in the steering wheel or floor. This points to a worn inner or outer joint.
- Grease on Wheels/Suspension: Black, heavy grease slung on the inside of your wheel or on nearby suspension parts is a clear sign of a torn CV boot.
Choosing the Right Aftermarket CV Axle
When it comes to replacing a CV axle on an Audi, there is a significant difference in quality between Original Equipment (OEM) and many aftermarket parts. Forum discussions with S4 owners often highlight that cheap aftermarket axles can cause vibrations and fail much sooner than original parts.
Here’s a breakdown of your options:
- OEM (Original Equipment Manufacturer): These are the highest quality and most expensive option, often costing over $1,000 per axle. They are guaranteed to fit and perform exactly like the original part.
- OEM Supplier (e.g., GKN): GKN is a known manufacturer of original Audi axles. Buying a GKN-branded axle is often much cheaper than the Audi-branded part but provides identical quality. This is a highly recommended option for S4 owners.
- New Aftermarket (e.g., Surtrak, Trakmotive, GSP): This is the most budget-friendly category. Brands like Surtrak are new parts, not rebuilt, and meet basic fitment requirements. However, the quality of the materials and balancing may not be as high as OEM. While they come with a lower price, some owners report issues like vibrations or a shorter lifespan.
Pro Tip: Many experienced Audi owners and mechanics recommend using an OEM supplier like GKN over cheaper aftermarket brands to avoid potential issues with vibration and ensure longevity. If a boot is torn but the joint isn't making noise yet, you can replace just the boot and repack it with grease, but this is a very messy job.
🎬 See how to repair a ripped boot without replacing the axle.Known Issues, Recalls, or TSBs
Searches of the National Highway Traffic Safety Administration (NHTSA) database and for Technical Service Bulletins (TSBs) did not find any specific recalls or service campaigns related to the CV axle shafts for the 2011-2016 Audi S4. Recalls for this vehicle generation typically concern other issues like the fuel system or airbags.
Replacement Cost
The cost to replace a CV axle shaft can vary widely based on the parts you choose and who does the labor. The table below gives a general idea of what to expect for a single axle replacement.
| Part/Service | Estimated Cost |
|---|---|
| New OEM Part | $1,000 - $1,800 |
| New Aftermarket Part | $193 - $362 |
| Shop Labor | $190 - $500 |
| Total Professional Replacement (Aftermarket) | $383 - $862 |
| Total Professional Replacement (OEM) | $1,190 - $2,300 |
Frequently Asked Questions (FAQ)
Should I replace just the boot or the whole axle?
If the boot is torn but the joint is not making any clicking or popping noises, you can replace just the boot and repack the joint with grease. However, this is a very messy and labor-intensive job. Most shops and DIYers find it faster and easier to replace the entire axle assembly, especially since the joint may have been contaminated with dirt and moisture.
Are cheap aftermarket axles okay for my S4?
While budget-friendly, many cheaper aftermarket axles have a reputation for causing vibrations or failing prematurely on high-performance, all-wheel-drive cars like the S4. The general consensus among Audi enthusiasts is to spend more on a quality OEM supplier part like GKN to avoid future problems.
Do I need to replace my CV axles in pairs?
No, you do not need to replace them in pairs. You only need to replace the specific axle that has failed. The other axles can be left alone unless they are also showing signs of wear.
Is replacing an S4 CV axle a good DIY job?
For an experienced DIY mechanic, this is a manageable job that can take 2-4 hours. 🎬 Watch this step-by-step guide for replacing the front axle shaft. It requires specific tools, including a 17mm hex socket for the axle bolt and a 10mm triple square socket 🎬 Check out these helpful tips for removing the passenger side axle. for the inner joint bolts. You will also need a heavy-duty torque wrench to properly tighten the new axle bolt.
Helpful Videos
Technical Specifications
OEM Part Numbers: 8K0407271AJ 8K0407271Q 8K0407271AH 8K0407451LX
Requires a 10mm triple square socket for the inner joint bolts and a 17mm hex head (Allen) socket for the main axle bolt. Torque specs are high and require a capable torque wrench.
We Have This Part in Stock
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.
- Audi S4: