A Guide to Replacing Ignition Coils on the 2020-2025 Audi S6 (C8)
Keep your S6's twin-turbo V6 running smoothly by understanding when and how to replace your ignition coils.
- A failing ignition coil on an S6 will cause misfires, a rough idle, and a check engine light.
- It is highly recommended to replace all six coils at once, along with the spark plugs, to ensure reliability.
- Reputable aftermarket brands like Bosch and Delphi offer OEM-quality performance for less than dealer prices.
- This is a straightforward DIY repair for owners with basic tools, saving on labor costs.
Is Your Audi S6 Misfiring? It Could Be an Ignition Coil
A failing ignition coil is a common wear item on many modern engines, including the 2.9L V6 in your 2020-2025 Audi S6. When a coil starts to fail, it can't deliver the strong, consistent spark the engine needs. This can cause a range of noticeable problems, from a simple annoyance like a rough idle to a serious, flashing Check Engine Light that indicates a severe misfire. Ignoring these symptoms can lead to reduced fuel economy, failed emissions tests, and potentially even damage to your catalytic converter, which is an expensive repair.
Symptoms of a Failing Ignition Coil
If your S6 is experiencing any of the following issues, a bad ignition coil could be the culprit:
🎬 Watch: Learn more about the common symptoms of a bad coil.- Engine Misfires: The car may shake, shudder, or hesitate, especially during acceleration or while idling.
- Check Engine Light: A steady or flashing Check Engine Light is a common sign. A flashing light is serious and means you should stop driving to prevent damage. Common codes include P0300 (random misfire) or P0301-P0306 (for specific cylinders).
- Rough Idle: The engine may run unevenly or vibrate when the car is stopped.
- Reduced Power: You might notice the car feels sluggish and doesn't accelerate as quickly as it should.
- Worse Fuel Economy: An engine that isn't running efficiently will burn more fuel.
Known Issues, Recalls, and Service Bulletins
As of early 2026, there are no active recalls or specific Technical Service Bulletins (TSBs) from Audi or the NHTSA directly related to ignition coil failure for the 2020-2025 Audi S6. Failures are typically due to normal wear and tear over time and mileage.
Choosing the Right Aftermarket Ignition Coil
When shopping for a replacement, you'll find several brands available. They generally fall into a few tiers of quality and price.
Tier 1: OEM-Quality Brands
- Bosch: Bosch is a well-known original equipment manufacturer for many European brands, including Audi. Their coils are engineered to meet or exceed factory specifications and are considered a reliable, high-quality choice.
- Delphi: Similar to Bosch, Delphi is another top-tier supplier with a strong reputation for quality and reliability in ignition components. Many mechanics consider Bosch and Delphi to be of equal performance and quality.
Tier 2: Reputable Aftermarket Brands
- Standard Ignition (SMP): A long-standing brand in the aftermarket, offering parts that are a solid alternative to OEM.
- Holstein: This brand provides a range of aftermarket parts that offer a balance between cost and quality.
Tier 3: Value-Oriented Brands
- DriveWire / Global Parts: These brands typically offer the most budget-friendly options. While they can get your car back on the road, the general consensus among mechanics is to be cautious with very low-cost electrical parts, as their long-term durability may not match that of the higher-tier brands.
A Note on Performance Coils
You may see "performance" coils from brands like APR that promise a hotter spark or more energy. For a stock or lightly modified S6, these are generally not necessary. A quality OEM-spec coil from a brand like Bosch or Delphi will provide the correct, reliable spark your engine was designed for.
Cost to Replace Audi S6 Ignition Coils
The cost can vary depending on whether you do the work yourself or take it to a shop. Your S6 has six ignition coils.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Ignition Coil (Single) | $35 - $75 |
| New OEM Ignition Coil (Single) | $75 - $105+ |
| Shop Labor (for all 6 coils) | $100 - $150 |
| DIY Cost (6 Aftermarket Coils) | $210 - $450 |
| Shop Cost (6 Aftermarket Coils + Labor) | $310 - $600+ |
Frequently Asked Questions
Is replacing an ignition coil a DIY job?
Yes, for someone with basic tools and mechanical skill, this is a very feasible DIY project. The coils are located on top of the engine and are easily accessible after removing the plastic engine covers. The job involves unplugging a connector and removing one or two bolts per coil.
🎬 See this walkthrough on how to change your coils and plugs.If one coil fails, should I replace all six?
It is highly recommended. Ignition coils are all the same age and have been exposed to the same conditions. If one has failed, others are likely to fail soon. Replacing them all at once saves you from repeating the job in the near future and ensures a consistent, reliable spark across all cylinders.
Should I replace my spark plugs at the same time?
Yes, it's an excellent idea. You have to remove the ignition coils to access the spark plugs anyway. Worn spark plugs can put extra strain on the ignition coils, causing them to fail prematurely. Replacing them together ensures your entire ignition system is in top shape. For the 2.9T engine, it's recommended to use fresh factory-spec plugs.
What are the OEM part numbers for the Audi S6 ignition coil?
Several part numbers may be used. Common ones include 06H905110P, 06H905110L, and 06H905110G. Always verify fitment with your vehicle's VIN before ordering.
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Technical Specifications
OEM Part Numbers: 06H905110P 06H905110L 06H905110G 079905110N 079905110R
Your 2020-2025 Audi S6 is equipped with the 2.9L twin-turbocharged V6 (EA839) engine, which requires six individual 'coil-on-plug' style ignition coils.
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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 S6:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Audi S6 Misfiring? It Could Be an Ignition Coil
- Symptoms of a Failing Ignition Coil
- Known Issues, Recalls, and Service Bulletins
- Choosing the Right Aftermarket Ignition Coil
- A Note on Performance Coils
- Cost to Replace Audi S6 Ignition Coils
- Frequently Asked Questions
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