A Guide to Replacing Ignition Coils on the 2012-2019 Audi A8 Quattro
If your Audi A8 is misfiring or losing power, a bad ignition coil is a likely culprit—here’s how to choose the right replacement.
- A flashing check engine light with rough running is the most common sign of a bad ignition coil; use an OBD-II scanner to identify the specific failing cylinder (codes P0301-P0308).
- For best results, replace all ignition coils and spark plugs at the same time to ensure balanced performance and prevent future failures.
- Stick with reputable aftermarket brands like Bosch, NGK, or Delphi for OEM-level quality and reliability; avoid the cheapest options which are known to fail prematurely.
- This is a very DIY-friendly repair that requires basic tools and can be completed in under two hours, saving significant labor costs.
Is Your Audi A8 Quattro Stuttering? It Could Be an Ignition Coil
A failing ignition coil is a common issue that can disrupt the smooth performance of your Audi A8's sophisticated engine. When a coil goes bad, the spark plug for that cylinder can't fire correctly, leading to an engine misfire. This can feel like a shudder, hesitation, or a significant loss of power, especially when you accelerate. Fortunately, replacing ignition coils is a straightforward repair that can restore your engine's performance.
Symptoms of a Failing Ignition Coil
Watch for these clear signs that one or more of your ignition coils may be failing:
- Engine Misfires: The engine may run rough, shake, or jerk, particularly when idling or under load.
- Flashing Check Engine Light: A misfire will almost always trigger the check engine light. If it's flashing, it indicates a severe misfire that could damage your catalytic converter, and you should reduce speed and have it checked immediately.
- Reduced Power and Acceleration: Your A8 may feel sluggish and slow to respond when you press the gas pedal.
- Worse Fuel Economy: When a cylinder isn't firing properly, your engine burns fuel less efficiently.
- Difficulty Starting: A weak or dead coil can make it harder for the engine to start.
Diagnosing the Problem with OBD-II Codes
If your check engine light is on, a simple OBD-II scanner can read the trouble codes. A general misfire code is P0300. Cylinder-specific codes, like P0301 (Cylinder 1), P0302 (Cylinder 2), and so on, will tell you exactly which coil is failing.
🎬 Watch this guide on how to find engine misfires.Choosing the Right Aftermarket Ignition Coil
You don't have to buy parts from the dealer to get your A8 running smoothly again. High-quality aftermarket brands often meet or exceed the original specifications. However, quality varies significantly, so it's important to choose a reputable brand. Avoid the cheapest, unbranded options, as they often use inferior materials and can fail prematurely.
Brand Quality Tiers for Your Audi A8
Here’s a breakdown of available brands to help you make an informed choice:
- Tier 1: OEM & Premium Aftermarket: Brands like Bosch, NGK, Delphi, and Hitachi are often the original equipment manufacturers for Audi. Choosing one of these is the safest bet for dealer-level quality, fit, and longevity. Bosch and NGK are highly trusted by mechanics for European vehicles.
- Tier 2: Quality Aftermarket: Brands such as Standard Ignition (SMP) and Walker Products offer a good balance of quality and value. They are established companies that engineer their parts to be reliable replacements, though some professional mechanics have reported occasional inconsistencies compared to Tier 1 brands.
- Tier 3: Economy Brands: This category includes DriveWire, Spectra, Holstein, Facet, and other budget-focused brands. While they offer significant cost savings, their long-term durability can be a gamble. These are best suited for situations where budget is the primary concern, but be aware that you may be replacing them again sooner than a premium part.
Pro Tip: Replace Coils and Plugs as a Set
If one ignition coil has failed and the others are original, it's wise to replace all of them at the same time. They have all been exposed to the same heat and wear, so others are likely to fail soon. It's also highly recommended to replace your spark plugs during the job, as worn plugs can strain the new coils and cause them to fail prematurely.
Cost of Replacing Audi A8 Quattro Ignition Coils
| Part / Service | Estimated Cost (Per Coil) | Estimated Cost (Full Set of 8) |
|---|---|---|
| New OEM (Dealer) | $80 - $150 | $640 - $1,200+ |
| New Aftermarket (Tier 1) | $50 - $90 | $400 - $720 |
| New Aftermarket (Tier 2/3) | $33 - $55 | $264 - $440 |
| Shop Labor | $100 - $225 (for the whole job) | |
Cost estimates are approximate and can vary based on your location, vehicle's specific engine (V6, V8, W12), and the repair shop's labor rates.
Frequently Asked Questions (FAQ)
Is replacing an ignition coil a DIY job?
Yes, for most owners with basic tools. The coils are located on top of the engine under the plastic cover. Each coil is held by one or two bolts and has a single electrical connector. 🎬 See how to safely remove the ignition coil harness. The process involves removing the cover, unplugging the connector, unbolting the old coil, and installing the new one. It typically takes less than an hour for a V8.
Should I replace all ignition coils at once?
It is highly recommended. Ignition coils wear out at a similar rate. If one has failed, the others are likely near the end of their service life. Replacing them all at once saves you from repeated repairs and ensures balanced engine performance.
What's the difference between an ignition coil and a spark plug?
The ignition coil creates the high-voltage electricity, and the spark plug receives that electricity to create the physical spark inside the cylinder. They work together, and it's best practice to replace them at the same time.
🎬 Watch a complete walkthrough of an A8L spark plug change.Were there any recalls on the 2012-2019 Audi A8 ignition coils?
No, there have been no specific recalls issued by the NHTSA for ignition coil failure on the 2012-2019 Audi A8 Quattro. However, there was a recall for some 2019 models for a missing seal on the engine control module connector that could allow moisture entry, and another for some 2013-2016 models for a porous fuel line. Always check your VIN on the NHTSA website for any open recalls.
Helpful Videos
Technical Specifications
OEM Part Numbers: 06E905115G 079905110P 07P905715 06J905110N 06E905115F 06E905115E
Coil-on-plug (pencil type), 12V, 4-pin connector. Specific part numbers vary by engine (3.0T V6, 4.0T V8, 4.2L V8, 6.3L W12).
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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 A8 Quattro:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Audi A8 Quattro Stuttering? It Could Be an Ignition Coil
- Symptoms of a Failing Ignition Coil
- Diagnosing the Problem with OBD-II Codes
- Choosing the Right Aftermarket Ignition Coil
- Brand Quality Tiers for Your Audi A8
- Pro Tip: Replace Coils and Plugs as a Set
- Cost of Replacing Audi A8 Quattro Ignition Coils
- Frequently Asked Questions (FAQ)
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