Audi A6 Serpentine Belt Replacement Guide (2013-2017)
Hearing squeals or seeing warning lights? Your A6's serpentine belt might be the cause.
- Plan to replace your A6's serpentine belt around 75,000 miles to prevent being stranded.
- Squealing noises are often caused by the belt tensioner, not just the belt; it's best to replace them together.
- High-quality aftermarket brands like Gates and Continental are reliable, cost-effective alternatives to OEM parts.
- Do not drive the vehicle if the serpentine belt breaks; pull over immediately to prevent critical engine damage.
Is Your Audi A6 Serpentine Belt Failing?
A serpentine belt is a wear-and-tear item. It is made of rubber that cracks and wears out from heat and use. Most A6 owners should plan to replace the belt around the 75,000-mile mark as preventative maintenance. If you notice any of the following symptoms, your belt or its tensioner may be failing and needs immediate inspection.
Key Failure Symptoms:
- Squealing or Chirping Noises: A high-pitched squeal, especially when you start the engine on a cold day, is the most common sign of a worn or slipping belt. This noise can also point to a failing belt tensioner, which is a very common issue on these cars.
- Warning Lights: If the belt slips or breaks, the alternator will stop charging the battery. This will trigger the battery or alternator warning light on your dashboard.
- Engine Overheating: The serpentine belt drives the water pump, which circulates coolant to keep the engine cool. A broken belt will cause the engine to overheat quickly.
- Stiff Steering: The belt powers the power steering pump. If it fails, steering will become very heavy and difficult, which is unsafe.
- Visible Wear: Pop the hood and look at the belt. If you see cracks, frayed edges, a shiny or glazed surface, or chunks of rubber missing, it's time for a new one.
A Note on Belt Tensioners
On the 2013-2017 Audi A6, the automatic belt tensioner is often the true cause of belt-related noises. This part keeps the belt tight. When its internal spring weakens, the belt can slip and make noise, even if the belt itself looks new. It is highly recommended to replace the tensioner at the same time as the serpentine belt, especially if your car has over 75,000 miles or is making noise.
🎬 See how to replace the tensioner on a 2.0t engine.Choosing an Aftermarket Serpentine Belt
You do not need to buy a serpentine belt from an Audi dealership to get a quality part. Many aftermarket companies are the original equipment manufacturers (OEM) for Audi, meaning they make the exact same part, just sold in a different box.
- Premium Aftermarket (Gates, Continental): Brands like Gates and Continental are excellent choices for an Audi. They are often the OEM supplier and produce high-quality, durable belts that meet or exceed the original specifications. For a critical part like this, spending a few extra dollars for a premium brand is a smart investment.
- Standard Aftermarket (Dayco): Dayco is a well-known brand that offers a reliable and more budget-friendly option. While some mechanics have preferences, Dayco belts are used by many professionals and are considered a solid choice for a standard replacement.
Pro Tip: Consider buying a kit that includes both the serpentine belt and the belt tensioner. This ensures all the main wear components are replaced at once and can prevent you from having to do the job twice.
| Part / Service | Estimated Cost |
|---|---|
| New Aftermarket Belt | $17.76 - $51.83 |
| New OEM Belt | $40 - $90 |
| Shop Labor | $80 - $160 |
| Total Professional Replacement | $120 - $250 |
Frequently Asked Questions
How often should I replace the serpentine belt on my A6?
You should inspect it at every oil change and plan to replace it around 75,000 miles as preventative maintenance. If you live in a very hot climate or do a lot of city driving, you may need to replace it sooner.
Can I drive my Audi with a broken serpentine belt?
No. A broken belt will cause the engine to overheat and the battery to die very quickly. You will also lose power steering, making the car unsafe to drive. Pull over immediately and shut off the engine to prevent serious damage.
Is it hard to replace the serpentine belt myself?
For a DIY mechanic with the right tools, it is a manageable job. However, the space in the Audi A6 engine bay is very tight, which can make it frustrating. You will need a specific tool to release the belt tensioner. 🎬 Check out these helpful tips for removing and reinstalling the belt. If you are not comfortable working in tight spaces, it may be best to leave this job to a professional.
🎬 Watch this complete 3.0t belt replacement walkthrough for DIY owners.Should I replace the tensioner and pulleys with the belt?
Yes, it is highly recommended. A worn tensioner is a common cause of belt failure and noise on these vehicles. Replacing the belt, tensioner, and any idler pulleys as a kit is the best way to ensure a long-lasting and quiet repair.
Helpful Videos
Technical Specifications
OEM Part Numbers: 06E903137AB
For the 2013-2017 Audi A6, there are different belts for the 2.0T and 3.0T engines. The 3.0T also has a separate, shorter belt for the supercharger. Always verify the correct part number for your specific engine before ordering.
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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 A6: