A Comprehensive Guide to the CV Axle Shaft for the 2008-2019 Audi A5
Hearing clicking sounds on turns or feeling vibrations? Your Audi A5's CV axle shaft may need attention.
- The most common sign of a bad CV axle is a clicking noise when making sharp, slow turns.
- A torn rubber boot is the start of failure; inspect your inner wheels for grease splatter regularly.
- OEM (GKN) axles offer the best quality but are very expensive; aftermarket brands like Surtrak are a cost-effective alternative but may not last as long.
- DIY replacement is possible but requires special tools like triple square and large hex sockets, and dealing with a very high-torque axle bolt.
Is Your Audi A5's CV Axle Failing?
A CV axle doesn't have a set replacement schedule; it's replaced when it fails. The most common failure begins when the protective rubber boot tears. This boot holds special grease that lubricates the joint. When it rips, grease slings out and dirt and moisture get in, quickly wearing out the joint's internal parts.
Key Symptoms of a Bad CV Axle
- Clicking or Popping Noise When Turning: This is the most classic sign of a worn outer CV joint. The sound is most noticeable during slow, sharp turns, like in a parking lot. 🎬 Watch: Hear what a failing Audi CV joint sounds like.
- Vibrations While Driving: A damaged or unbalanced axle can cause vibrations that you feel through the car, especially during acceleration. This can sometimes be mistaken for a wheel balance issue.
- Visible Grease Leak: If the CV boot is torn, it will sling dark, heavy grease onto the inside of your wheel, brake components, and suspension. This is a clear visual sign of a problem.
- Knocking or Clunking Sounds: A worn inner CV joint can create a clunking noise when you accelerate, decelerate, or shift gears.
Known Issues & Similar Symptoms on the Audi A5
Not all noises and vibrations are from the CV axle. Be aware of these vehicle-specific issues:
- Rear Axle Alignment Recall: Audi issued recalls (including 42L1 and 42L5) for some 2019-2021 A5 models due to a lock nut on the rear axle's trailing arm that could break. This can cause rear-wheel misalignment, uneven tire wear, and a feeling of the car pulling to one side. This is a separate issue from the CV axle itself but affects the axle assembly area.
- TSB for Drivetrain Noise: Technical Service Bulletin 2059129 addresses noises or vibrations in tight turns on 2018-2023 models. The recommended fix is to change the center differential fluid, as the noise is not caused by the CV joint. It can take up to 600 miles for the new fluid's additives to resolve the noise.
Choosing the Right Aftermarket CV Axle
When replacing a CV axle on your A5, you have a few options, each with its own trade-offs between cost and quality.
OEM vs. Aftermarket Quality
The original equipment manufacturer (OEM) for Audi is GKN. These axles are engineered specifically for your vehicle, often featuring hollow shafts with rubber dampers to reduce vibration. They are built with high-quality materials and are known for their long life. However, they are very expensive, sometimes costing over $1,000 per axle.
Aftermarket axles are a much more affordable option. However, quality can vary greatly. Many budget-friendly aftermarket axles are made with solid, heavier shafts that may lack the balancing and refinement of the OEM part, sometimes leading to vibrations. The quality of the rubber boots and the grease used can also be lower than OEM standards, potentially leading to a shorter lifespan.
Aftermarket Brand Tiers
- Premium Aftermarket / Rebuilt OEM: Companies like Raxles specialize in rebuilding original OEM axles with high-quality components. This is often considered the best-of-both-worlds option, providing OEM quality at a lower price point, though still more expensive than budget brands.
- Standard Aftermarket (e.g., Surtrak): Brands like Surtrak offer new, complete axle assemblies at a very attractive price. Forum discussions suggest they are a functional, budget-friendly choice, but may not offer the same longevity or perfect balance as an OEM part. They are a practical option if keeping costs down is the primary goal.
Pro Tip: Replace the Whole Axle, Not Just the Boot
🎬 See how to repair a torn boot if the joint is still good.If you hear clicking, the joint is already damaged. While you can replace just the torn boot if you catch it very early before noise starts, most shops and experienced DIYers recommend replacing the entire axle shaft assembly. The cost of labor to replace just the joint or boot is often close to the cost of replacing the whole unit, making a full axle replacement more time- and cost-effective.
Cost of Replacing an Audi A5 CV Axle Shaft
| Part/Service | Estimated Cost |
|---|---|
| New OEM Axle Shaft | $700 - $1,600+ |
| New Aftermarket Axle Shaft | $167 - $377 |
| Shop Labor | $150 - $350 |
| Total Professional Replacement (Aftermarket Part) | $317 - $727 |
Costs are estimates and can vary based on your location, vehicle model, and the specific parts used.
Frequently Asked Questions
Can I drive with a bad CV axle?
You can, but it's not recommended for long. A clicking CV joint will get progressively worse. If it fails completely, the axle will break, and your car will lose power to that wheel, leaving you stranded. It's a safety issue that should be addressed promptly.
Should I replace CV axles in pairs?
It's not strictly necessary. Unlike brakes or tires, you can replace just the one failed axle. However, since both axles have the same age and have been subjected to the same conditions, it's common for the other side to fail soon after the first. If your budget allows, replacing them in pairs can save you a future trip to the shop.
Is replacing an Audi A5 CV axle a DIY job?
It is a feasible DIY project for someone with intermediate mechanical experience. However, it requires special tools, including an M10 triple square socket for the inner bolts and a large 17mm or 19mm hex socket for the main axle bolt. The axle bolt is torqued very tightly and can be difficult to remove. The passenger side axle is known to be more difficult than the driver's side due to tighter clearances.
🎬 Watch this step-by-step walkthrough of the full axle replacement process.Do I need a wheel alignment after replacing a CV axle?
If you can replace the axle without separating the upper or lower control arms from the steering knuckle, you may not need an alignment. However, if any suspension components are disconnected to gain clearance, an alignment is highly recommended to prevent uneven tire wear.
Helpful Videos
Technical Specifications
OEM Manufacturer: GKN. The front left and front right axles are often the same part number on B8 platform cars. Replacement requires an M10 triple square socket, a 17mm or 19mm hex socket for the axle bolt, and a high-torque wrench or breaker bar. The axle bolt is a one-time-use stretch bolt and should be replaced.
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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.
- Audi A5:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Audi A5's CV Axle Failing?
- Key Symptoms of a Bad CV Axle
- Known Issues & Similar Symptoms on the Audi A5
- Choosing the Right Aftermarket CV Axle
- OEM vs. Aftermarket Quality
- Aftermarket Brand Tiers
- Pro Tip: Replace the Whole Axle, Not Just the Boot
- Cost of Replacing an Audi A5 CV Axle Shaft
- Frequently Asked Questions
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