A Guide to Spark Plugs for the 2013-2024 Mazda CX-5
Keep your CX-5's Skyactiv engine running efficiently by choosing the right spark plugs.
- Only use Iridium spark plugs; Mazda's Skyactiv engines require them for proper function.
- The 2.5L Turbo engine requires different spark plugs and a much shorter replacement interval (40,000 miles) than the non-turbo engine (75,000 miles).
- NGK is the OEM supplier and the most recommended brand for the CX-5.
- Buy from reputable auto parts stores to avoid counterfeit plugs that can damage your engine.
Signs of Failing Spark Plugs
Worn spark plugs can cause several noticeable issues. If you experience any of these symptoms, it might be time for a replacement.
- Rough Idling: Your engine may shake or vibrate more than usual when the car is stopped.
- Engine Misfires: You might feel a hesitation or stumbling from the engine during acceleration. 🎬 Watch this guide to diagnosing misfires and rough idling issues. This can trigger the check engine light.
- Reduced Fuel Economy: If you're stopping for gas more often, failing plugs could be the cause, as they lead to inefficient fuel combustion.
- Slow Acceleration: A car with bad spark plugs will feel sluggish and lack its usual power.
- Difficulty Starting: While less common with modern plugs, completely fouled plugs can make it hard to start the engine.
When to Replace Your Spark Plugs
Mazda has different service intervals depending on your engine. It is crucial to follow the correct schedule for your specific CX-5 model to maintain performance and avoid engine issues.
- For CX-5 models with the naturally aspirated 2.0L or 2.5L Skyactiv-G engine, the recommended replacement interval is every 75,000 miles.
- For CX-5 models with the 2.5L Skyactiv-G Turbo engine, the interval is much shorter, at every 40,000 miles. Turbocharged engines are harder on spark plugs, requiring more frequent changes. 🎬 See a step-by-step walkthrough for turbo engine spark plug maintenance.
Pro Tip: Check Your Engine
If you are unsure which engine your CX-5 has, check the engine cover or your owner's manual. The turbocharged engine requires different plugs and a more frequent replacement schedule. Using the wrong plugs or extending the interval can lead to performance problems.
Choosing the Right Aftermarket Spark Plug
Mazda uses high-quality NGK iridium spark plugs from the factory. When shopping for aftermarket replacements, it's important to choose a plug that meets or exceeds OEM specifications. For the CX-5, this means you should only use iridium spark plugs. They provide the long life and consistent performance that Skyactiv engines require.
Brand Tiers
- OEM-Equivalent (Best Choice): NGK is the original equipment manufacturer for Mazda. Choosing NGK Laser Iridium or Iridium IX plugs is a safe bet for guaranteed compatibility and performance. Many owners and mechanics strongly recommend sticking with NGK.
- Reputable Aftermarket: Bosch and Champion also produce high-quality iridium plugs that are compatible with the CX-5. Bosch Double Iridium plugs are known for their long service life. While these are good brands, NGK is the most commonly recommended for Mazda vehicles.
- Budget Brands: While lower-priced plugs are available, they may not offer the same longevity or performance. Given the importance of spark plugs in the high-compression Skyactiv engine, it is not recommended to cut corners here.
Warning: Avoid Counterfeits
There is a known issue with counterfeit spark plugs being sold on major online marketplaces. These fake plugs can cause misfires, poor performance, and even engine damage. To be safe, purchase your spark plugs from a reputable auto parts store or an authorized dealer.
| Item | Estimated Cost |
|---|---|
| New OEM (Dealer) | $130 - $200 |
| New Aftermarket (DIY) | $32 - $120 |
| Shop Labor | $110 - $161 |
| Total Professional Replacement | $282 - $384 |
Frequently Asked Questions (FAQ)
Do I need special tools to change my CX-5's spark plugs?
Yes, you will need a 14mm thin-wall spark plug socket, a ratchet with extensions, and a torque wrench. A torque wrench is critical for tightening the new plugs to the correct specification (11-15 ft-lbs) to avoid damage.
Do I need to gap the new spark plugs?
Most iridium spark plugs for the CX-5 come pre-gapped from the factory. It is a good idea to verify the gap with a feeler gauge before installation, but you should not attempt to adjust the gap on an iridium plug, as you can easily damage the fine tip. The correct gap for the non-turbo engine is around 1.1mm (0.044"), while the turbo engine requires a smaller gap around 0.75mm (0.030").
Are there any recalls for Mazda CX-5 spark plugs?
No, there are no specific recalls for spark plugs on the 2013-2024 Mazda CX-5. There was a recall for some 2018-2019 models related to engine software that could cause a stall, but it was not directly a spark plug issue.
Is it hard to replace the spark plugs myself?
No, for most people this is a very straightforward DIY job. The spark plugs are easily accessible on top of the engine after removing the plastic engine cover. The entire job can typically be completed in under an hour with basic tools.
🎬 Watch: How to change spark plugs on modern Mazda 2.5L engines.Helpful Videos
Technical Specifications
OEM Part Numbers: PE5R-18-110 PY8W-18-110
Material: Iridium. Socket Size: 14mm Thin-Wall. Non-Turbo Gap: ~1.1mm (0.044"). Turbo Gap: ~0.75mm (0.030"). Torque Spec: 11-15 ft-lbs (15-20 Nm).
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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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