A Guide to Replacing Ignition Coils on a 2012-2017 Audi A4 Quattro
Keep your Audi's 2.0T engine running smoothly by understanding when and how to replace your ignition coils.
- Ignition coil failure is a common problem on the 2.0T engine, often occurring between 30,000 and 60,000 miles.
- It is highly recommended to replace all four ignition coils and spark plugs at the same time for reliability.
- A flashing check engine light indicates a severe misfire; pull over and stop driving to prevent catalytic converter damage.
- Bosch and NGK are trusted OEM-quality aftermarket brands, while APR and CTS Turbo offer performance upgrades.
Is it Time to Replace Your Ignition Coils?
Ignition coil failure is a common issue on this generation of Audi A4. While there's no official replacement schedule, many owners report failures anywhere between 30,000 and 60,000 miles. If one coil fails, it's a good idea to replace all four at the same time, as the others are likely to fail soon after. This preventative approach can save you from being stranded.
Key Symptoms of a Failing Ignition Coil:
- Check Engine Light: This is often the first sign. The light may be solid or, more seriously, flashing. A flashing light indicates a constant misfire, and you should stop driving immediately to prevent engine damage. 🎬 Learn how to check for bad coils on your 2.0T engine.
- Engine Misfires: You might feel a jerking or sputtering sensation, especially when you accelerate. The engine may also run rough, shake, or vibrate at idle.
- Reduced Power and Poor Fuel Economy: A weak spark means the engine isn't running efficiently, leading to sluggish acceleration and more trips to the gas station.
- Difficulty Starting: A failing coil may not provide enough power to the spark plugs to start the engine easily.
- Backfiring: You might hear a popping sound from the exhaust, which is unburnt fuel igniting.
Choosing the Right Aftermarket Ignition Coil
When it comes to ignition coils for your A4, you have several options. While the original equipment (OEM) part is always a safe bet, many aftermarket brands offer excellent quality, sometimes with performance benefits.
Brand Quality Tiers for Audi A4 Quattro (B8.5)
| Tier | Brands | Notes |
|---|---|---|
| OEM / Premium Aftermarket | Bosch, NGK, Beru, Denso | These brands are often the original equipment suppliers to Audi. They offer reliability and performance that meets or exceeds factory standards. Bosch and NGK are highly reputable choices among Audi owners. |
| Performance Upgrade | APR, CTS Turbo, 034Motorsport | These brands are popular with enthusiasts and claim to offer a stronger, more consistent spark, sometimes with up to 10-14% more energy output than stock coils. They are a direct plug-and-play upgrade. |
| Standard Aftermarket | Delphi, Standard Ignition (SMP), Walker Products, Holstein | These are reputable brands that produce reliable, OE-quality replacement parts. They are a solid choice for a standard repair without the higher cost of performance brands. |
| Economy | DriveWire, Global Parts, Motorad | These brands offer a more budget-friendly option. While they can be a good value, some owners prefer to stick with more established names for critical ignition components. |
Pro Tip: Diagnosing a Bad Coil
If you have a check engine light with a misfire code for a specific cylinder (e.g., P0301 for cylinder 1), you can confirm the bad coil yourself. Simply swap the ignition coil from the misfiring cylinder with a coil from another cylinder. Clear the codes and drive the car. If the misfire code moves to the new cylinder, you've confirmed the coil is faulty. For example, if you swap the coil from cylinder 1 to cylinder 2 and the code changes from P0301 to P0302, the coil is the problem.
🎬 Watch: A quick guide to diagnosing bad coil packs yourself.Known Issues, Recalls, and TSBs
While there have been recalls for ignition-related issues on other Audi A4 model years, searches of the National Highway Traffic Safety Administration (NHTSA) database did not show any open recalls specifically for ignition coils on the 2012-2017 Audi A4 Quattro. However, a Technical Service Bulletin (TSB #01146320336302) from 2014 notes that proper diagnosis is needed before replacing ignition coils, as other issues can cause misfires. Always diagnose the problem correctly before replacing parts.
Frequently Asked Questions (FAQ)
Should I replace my spark plugs at the same time?
Yes, it is highly recommended. Worn spark plugs can put extra strain on the new ignition coils, causing them to fail prematurely. Since you already have the coils out, replacing the spark plugs adds very little extra time or labor.
🎬 See this DIY walkthrough for replacing both plugs and coils.Can I mix and match ignition coil brands?
It is best practice to replace all four ignition coils with the same brand to ensure consistent performance across the ignition system. Mixing brands could lead to slight differences in voltage output and engine performance.
Are performance ignition coils worth it for a daily driver?
For a stock or lightly modified car, high-quality OEM-equivalent brands like Bosch or NGK are perfectly sufficient. Performance coils from brands like APR may offer benefits like a smoother idle and sharper throttle response, but the difference may not be dramatic on an otherwise stock engine.
What are the most common misfire codes?
Common codes include P0300 (Random/Multiple Cylinder Misfire) and P0301, P0302, P0303, P0304, which correspond to misfires in cylinders 1, 2, 3, and 4, respectively. Cylinder 1 is the one closest to the front of the engine.
Helpful Videos
Technical Specifications
OEM Part Numbers: 06E905115E 06E905115F 06E905115G 06H905115B 07K905715G
Engine: 2.0L TFSI (EA888 Gen 2). Quantity Required: 4. Type: Coil-on-Plug (Pencil Style).
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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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