A Guide to Replacing the Ignition Coils on Your 2015-2021 Mazda 6
Keep your Mazda 6's Skyactiv engine running smoothly by understanding when and how to replace your direct ignition coils.
- Ignition coil replacement on the 2015-2021 Mazda 6 is a very easy DIY job, requiring only an 8mm socket.
- A flashing check engine light indicates a serious misfire; you should avoid driving to prevent catalytic converter damage.
- For cars with over 80,000 miles, it is wise to replace all four coils and the spark plugs at the same time for preventative maintenance.
- Check for TSB 01-014/16 if you have a 2014-2016 model, as early factory coils were known to fail.
Is Your Mazda 6 Ignition Coil Failing?
Ignition coil failure is a common issue as a car gets older. For the 2015-2021 Mazda 6 with the Skyactiv-G 2.5L engine, the coils are generally reliable but can fail over time due to constant exposure to high engine heat and vibration. When a coil starts to go bad, the signs are usually obvious and can affect your car's performance.
🎬 Watch: Common symptoms of a bad ignition coilChoosing the Right Aftermarket Ignition Coil
You don't need to buy the most expensive coil from the dealer to get your Mazda 6 running right, but you should avoid the cheapest no-name options. Owner forums are full of stories about ultra-cheap coils failing within a few months. Here’s a look at the brands available:
- Hella: Hella is a well-known German manufacturer that often supplies parts directly to automakers. They are considered a high-quality aftermarket option, providing reliability that is often on par with the original parts.
- Beck Arnley: This is a respected aftermarket brand known for sourcing parts from various suppliers, including original equipment manufacturers. In many cases, a Beck Arnley part might be the same as the OEM part, just in a different box. They are a solid choice for a balance of quality and price.
- Karlyn STI: Karlyn is often a more budget-friendly option. While they can be a good value, their long-term durability may not match that of premium or OEM-supplier brands. They can be a suitable choice if the budget is the primary concern.
Pro Tip: Replace Spark Plugs at the Same Time
Worn-out spark plugs can put extra strain on new ignition coils, causing them to fail prematurely. If your car has over 80,000 miles or you don't know when the spark plugs were last changed, it's a smart move to replace them when you replace the coils.
🎬 See this guide on how to replace your spark plugsKnown Issues, Recalls, and TSBs
There are no major recalls for ignition coils on the 2015-2021 Mazda 6. However, Mazda did issue a Technical Service Bulletin (TSB 01-014/16) for some 2014-2016 models. This TSB noted that ignition coils made by a specific supplier (YUMEBISHI) before March 28, 2016, could fail due to large temperature changes, leading to misfires and check engine light codes (P0300-P0304). The solution is to replace the faulty coils with updated parts.
DIY Installation Guide
Replacing the ignition coils on a 2015-2021 Mazda 6 is a very easy job that most DIYers can handle in under an hour with basic tools.
- Locate the Coils: Remove the plastic engine cover by simply pulling it up. You will see the four ignition coils in a row on top of the engine.
- Disconnect: Press the tab on the electrical connector and pull it off the coil.
- Remove the Bolt: Use an 8mm socket to remove the single bolt holding the coil in place.
- Remove the Coil: Gently pull the coil straight up to remove it from the spark plug well.
- Install the New Coil: It's a good practice to apply a small amount of dielectric grease to the inside of the new coil's boot. Push the new coil firmly down onto the spark plug until it seats properly.
- Reinstall and Reconnect: Secure the coil with the 8mm bolt (do not overtighten), reconnect the electrical connector until it clicks, and replace the engine cover. 🎬 Watch this step-by-step Mazda 6 ignition coil replacement walkthrough
Cost to Replace Mazda 6 Ignition Coils
| Item | Estimated Cost |
|---|---|
| New Aftermarket Ignition Coil (1) | $53.49 - $92.45 |
| Shop Labor (1 Coil) | $50 - $100 |
| DIY Total (1 Coil) | $53.49 - $92.45 |
| Shop Total (1 Coil) | $103.49 - $192.45 |
Frequently Asked Questions
Should I replace all four ignition coils at once?
While you can replace just the one that failed, it's highly recommended to replace all four, especially if your car has over 80,000 miles. Ignition coils are exposed to the same heat and wear, so if one has failed, the others may not be far behind.
What are the check engine codes for a bad ignition coil?
A bad ignition coil will usually trigger a check engine light. A generic misfire code is P0300. Specific cylinder misfire codes are P0301 (Cylinder 1), P0302 (Cylinder 2), P0303 (Cylinder 3), and P0304 (Cylinder 4).
What tools do I need to replace the coils?
The job is very simple and only requires a ratchet with an 8mm socket. A pocket screwdriver can help with the electrical connector tab, and dielectric grease is recommended for installation.
What happens if I don't replace a bad coil?
Continuing to drive with a misfiring coil can cause unburned fuel to enter the exhaust system, which can overheat and destroy your expensive catalytic converter. It will also cause poor performance, bad fuel economy, and could lead to stalling.
Helpful Videos
Technical Specifications
OEM Part Numbers: PE20-18-100A PE20-18-100B
This is a coil-on-plug (COP) style direct ignition coil. It is secured by one 8mm bolt and uses a 3-pin electrical connector.
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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.
- Mazda 6: