A Comprehensive Guide to the 2011-2016 Audi RS5 Serpentine Belt
Keep your RS5's high-revving 4.2L V8 performing flawlessly by understanding its essential serpentine belt.
- A squealing noise is the most common early warning sign of a failing serpentine belt or tensioner on your RS5.
- Due to tight engine bay access, replacing the belt is a difficult job best left to a professional mechanic.
- For maximum reliability, always replace the belt tensioner and idler pulleys at the same time as the belt.
- If the belt breaks, pull over immediately to prevent critical engine damage from overheating.
Is Your Audi RS5 Serpentine Belt Failing?
A serpentine belt is a wear-and-tear item made of durable EPDM rubber, but the high-heat environment of the RS5's 4.2L V8 means it will eventually need replacement. Ignoring the warning signs can leave you stranded and potentially lead to more severe engine issues. Watch for these common symptoms.
Key Failure Symptoms
- Squealing or Chirping Noises: A high-pitched squeal, especially on cold starts or during sharp turns, is the most common sign of a worn or slipping belt. This noise can be caused by a worn belt surface, a failing belt tensioner, or a misaligned pulley.
- Accessory Malfunctions: If your power steering feels heavy, the A/C blows warm air, or a battery warning light appears on your dashboard, the belt may not be providing enough power to those components.
- Visible Wear and Tear: A visual inspection can reveal a lot. Look for cracks, frayed edges, missing chunks of rubber, or a shiny, glazed appearance on the belt's surface.
- Engine Overheating: The serpentine belt drives the water pump. If the belt slips or breaks, coolant stops circulating, and the engine temperature will rise very quickly. If you see the temperature gauge climbing or steam from under the hood, pull over immediately.
Choosing the Right Aftermarket Serpentine Belt
For a high-performance vehicle like the Audi RS5, selecting a quality replacement belt is crucial. While an OEM (Original Equipment Manufacturer) belt from an Audi dealer is always an option, reputable aftermarket brands often provide the same level of quality, as they are frequently the original suppliers to the automaker.
Brand Options: Gates and Dayco
Both Gates and Dayco are well-respected manufacturers that produce OEM-quality belts. Many professional mechanics and enthusiasts trust both brands for their durability and performance. Gates belts are often noted for their quiet operation and are a direct OEM supplier for many car brands. Dayco also has a long history of producing reliable belts for both OEM and aftermarket applications. For your RS5, a belt from either Gates or Dayco will perform reliably, provided it is installed correctly with proper tension.
Pro Tip: Replace More Than Just the Belt
The serpentine belt works as part of a system. The belt tensioner and idler pulleys are also subject to wear. A worn tensioner can cause a new belt to slip or wear out prematurely. For a complete and lasting repair, it is highly recommended to replace the belt tensioner and any idler pulleys at the same time as the serpentine belt, especially on vehicles with over 60,000 miles.
Cost of Replacing Your RS5 Serpentine Belt
The cost can be broken down into parts and labor. The belt itself is relatively inexpensive, but labor can be a significant portion of the total cost due to the tight engine bay of the RS5.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Serpentine Belt (e.g., Gates, Dayco) | $15.50 - $39.12 |
| New OEM Audi Serpentine Belt | $30 - $110 |
| Shop Labor | $218 - $320 |
| Total Professional Replacement | $282 - $430+ |
Prices are estimates and can vary based on your location and the specific repair shop. Total cost does not include taxes, fees, or the replacement of tensioners and pulleys.
Frequently Asked Questions (FAQ)
When should I replace my 2011-2016 RS5's serpentine belt?
Most modern serpentine belts are designed to last between 60,000 and 100,000 miles. However, given the high-performance nature of the RS5, it's wise to inspect the belt at every oil change and plan for replacement around the 60,000-mile mark, or sooner if you notice any signs of wear.
Is this a DIY job for a home mechanic?
Replacing the serpentine belt on the RS5's 4.2L V8 is challenging due to very limited space in the engine bay. Accessing the belt and tensioner often requires putting the vehicle's front end into a "service position," which involves significant disassembly. While possible for an experienced DIYer with the right tools, it is generally recommended to have a professional mechanic 🎬 Watch this walkthrough of the serpentine belt replacement process. perform this job.
Are there any recalls or TSBs for the RS5 serpentine belt?
There are no specific recalls for the serpentine belt on the 2011-2016 Audi RS5. While Technical Service Bulletins (TSBs) exist for belt noises on other Audi models, none were found that specifically target this generation of the RS5 for serpentine belt failure.
What happens if the serpentine belt breaks while driving?
If the serpentine belt breaks, all the components it powers will stop working instantly. You will lose power steering, making the car very difficult to turn. The alternator will stop charging the battery, and the water pump will stop circulating coolant, causing the engine to overheat rapidly. You should pull over safely and immediately shut off the engine to prevent catastrophic damage.
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Technical Specifications
OEM Part Numbers: 079903137AG 079903137AB
The 2011-2016 Audi RS5 4.2L uses a 5-rib EPDM rubber serpentine belt. The OEM part number is 079903137AG.
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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.
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