A Guide to Ignition Coils for the 2015-2019 Mazda 3 Sport
Experiencing a rough idle or engine misfires? It might be time to check your ignition coils.
- A flashing check engine light is a critical warning; pull over immediately to prevent catalytic converter damage.
- This is a very easy DIY repair, requiring only an 8mm socket and about 15-30 minutes.
- For vehicles made before March 2016, check for TSB 01-014/16, as you may have a prematurely failing coil from a specific supplier.
- Avoid the cheapest no-name coils. Stick to reputable brands like NGK or Standard Ignition for reliability.
Is Your Mazda 3 Stuttering? Signs of a Failing Ignition Coil
When an ignition coil on your 2015-2019 Mazda 3 begins to fail, the symptoms are usually noticeable. Because these coils fail individually, you'll likely experience issues related to a single cylinder not firing correctly. Look out for these common signs:
- Engine Misfires: The car may shudder or hesitate, especially during acceleration.
- Rough Idle: The engine may run unevenly and vibrate more than usual when stopped. 🎬 Watch: How Mazda addresses rough idle and acceleration issues.
- Check Engine Light: A failing coil will almost always trigger the check engine light. If the light is flashing, it indicates a severe misfire that can quickly damage your expensive catalytic converter. Stop driving immediately if you see a flashing light.
- Reduced Power and Fuel Economy: With one cylinder not contributing, your car will feel less powerful and will use more fuel.
Known Issue: Technical Service Bulletin (TSB)
Mazda issued a Technical Service Bulletin (TSB 01-014/16) for some 2014-2016 Mazda 3 vehicles regarding premature ignition coil failure. This was traced to a specific manufacturer, YUMEBISHI, for coils produced before March 28, 2016. If your car falls in this range and has an original coil fail, the TSB recommends replacing the bad coil and also inspecting the others to see if they are from the same batch, replacing them as a preventative measure. The replacement parts are a modified design to correct the issue.
Choosing the Right Aftermarket Ignition Coil
When replacing an ignition coil, you don't have to buy the expensive OEM part from a dealer. Many aftermarket brands offer excellent quality, but it's important to choose wisely. Cheap, unbranded coils are known to fail quickly, causing the same problem all over again. Here’s a breakdown of the brands available:
- OEM-Quality Brands (NGK, Standard Ignition): NGK is a well-respected manufacturer of ignition parts and is often an original equipment supplier to Japanese automakers. Standard Ignition (SMP) is another reputable brand known for quality aftermarket components. These are your safest bet for reliability and longevity that meets or exceeds OEM standards.
- Performance Brands (Mishimoto): While primarily known for cooling systems, Mishimoto offers performance-oriented ignition coils. These may offer a slight performance edge but are generally not necessary for a daily-driven vehicle.
- Standard Replacement Brands (DriveWire, Facet, Holstein, Spectra, True Tech): These brands typically offer a balance of affordability and quality. They are a good option for budget-conscious repairs, but may not have the same long-term durability as the premium brands. User reviews for your specific vehicle are often the best guide here.
Pro Tip: Replace Spark Plugs at the Same Time
The ignition coils sit directly on top of the spark plugs. Since you're already removing the coil, it's a perfect time to replace the spark plugs if they are due. Worn spark plugs can put extra strain on the ignition coils, causing them to fail prematurely. Using high-quality Iridium plugs is recommended for the Mazda 3.
🎬 See this step-by-step guide for replacing your spark plugs.Replacement Cost for a 2015-2019 Mazda 3 Ignition Coil
Replacing an ignition coil on this Mazda 3 is a straightforward job that doesn't require much labor time, making it an affordable repair.
| Item | Estimated Cost |
|---|---|
| New OEM Ignition Coil (Single) | $145 - $180 |
| New Aftermarket Ignition Coil (Single) | $40 - $138 |
| Shop Labor (Single Coil) | $75 - $150 |
| DIY Cost (Single Aftermarket Coil) | $40 - $138 |
| Estimated Shop Total (Single Aftermarket Coil) | $115 - $288 |
Frequently Asked Questions
Is it difficult to replace the ignition coils myself?
No, this is a very easy DIY job for a beginner. The four ignition coils are located directly on top of the engine under a plastic cover that pulls right off. Each coil is held by a single 8mm bolt and an electrical connector. The entire process for one coil can take less than 15 minutes with basic tools.
🎬 Watch this quick walkthrough to replace your ignition coils.Should I replace all four ignition coils at once?
It's not strictly necessary, but it is often recommended, especially on higher-mileage vehicles. Ignition coils are wear items that operate under the same conditions. If one has failed due to age and heat cycles, the others may not be far behind. Replacing them all at once can save you from repeated repairs in the near future.
What are the diagnostic codes for a bad ignition coil?
A generic code scanner will typically show codes from P0301 to P0304 for a misfire in a specific cylinder (e.g., P0301 is cylinder 1). You might also see P0300, which indicates a random or multiple-cylinder misfire.
What is the difference between OEM and aftermarket coils for my Mazda 3?
OEM coils are the exact parts installed at the factory. High-quality aftermarket coils from brands like NGK or Standard Ignition are designed to meet or exceed OEM specifications and are often more affordable. However, very cheap, no-name aftermarket coils sold on marketplace sites are risky and often fail prematurely. For this car, sticking with a reputable aftermarket brand is a reliable and cost-effective choice.
Helpful Videos
Technical Specifications
OEM Part Numbers: PE20-18-100A
Coil-on-Plug, 4-pin connector, 8mm mounting bolt.
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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 3 Sport:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Mazda 3 Stuttering? Signs of a Failing Ignition Coil
- Known Issue: Technical Service Bulletin (TSB)
- Choosing the Right Aftermarket Ignition Coil
- Pro Tip: Replace Spark Plugs at the Same Time
- Replacement Cost for a 2015-2019 Mazda 3 Ignition Coil
- Frequently Asked Questions
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