A Guide to Spark Plug Replacement for the 2016-2022 Mazda CX-3
Keep your CX-3's Skyactiv engine running smoothly with the right spark plugs.
- Replace your CX-3's spark plugs every 75,000 miles as recommended by Mazda.
- Stick with NGK Iridium spark plugs, as they are the original factory part and ensure compatibility.
- Do not use anti-seize compound on NGK plugs; their special coating prevents seizing and using it can lead to over-tightening.
- Common signs of failure include a rough idle, poor fuel economy, and a check engine light with misfire codes (P0300-P0304).
Signs of Failing Spark Plugs in Your CX-3
When your spark plugs are worn out, your CX-3 will give you several warnings. Ignoring them can lead to worse fuel mileage and potential damage to your ignition system or catalytic converter. Look out for these common symptoms:
- Check Engine Light: A flashing or solid check engine light is a clear sign something is wrong. Misfire codes like P0300, P0301, P0302, P0303, or P0304 often point to a spark plug or ignition coil issue. 🎬 See how to diagnose and fix a P0300 random misfire.
- Rough Idle: If your engine shakes or sounds uneven when you're stopped, worn spark plugs could be the cause.
- Poor Acceleration: You might notice your CX-3 feels sluggish or hesitant when you press the gas pedal.
- Worse Fuel Economy: If you're filling up your gas tank more often, failing spark plugs might be wasting fuel.
- Engine Misfires or Surging: You may feel the engine stumble, hesitate, or jerk during acceleration. This is a classic sign of a misfire.
Choosing the Right Aftermarket Spark Plugs
Your Mazda CX-3 came from the factory with high-quality Iridium spark plugs, and it's important to replace them with plugs of similar or better quality. Mazda's Skyactiv engines are sensitive, and using cheap or incorrect plugs can cause performance issues.
Brand Quality Tiers for Mazda CX-3
| Tier | Brands | Why |
|---|---|---|
| Best (OEM Equivalent) | NGK | NGK is the Original Equipment Manufacturer (OEM) for Mazda, meaning they make the factory spark plugs. Choosing NGK Laser Iridium or Ruthenium plugs is the safest bet for guaranteed compatibility and performance. The OEM part number is PE5R-18-110, which often corresponds to an NGK model like ILKAR7L11. |
| Good | Bosch | Bosch is a well-respected German brand that produces high-quality Iridium spark plugs. While not the OEM for Mazda, their premium plugs are a reliable alternative and may be preferred for European vehicles. Ensure the specific model is listed as compatible with your CX-3. |
| Standard | Champion | Champion offers Iridium spark plugs that meet the basic requirements for your engine. They are a functional choice, but most Mazda specialists and owners prefer to stick with the OEM brand (NGK) for best results. |
Pro Tip: OEM is a Safe Bet
Since NGK is the factory supplier for your CX-3, you can't go wrong by choosing their aftermarket Iridium plugs. They are designed specifically for the demands of the high-compression Skyactiv engine.
🎬 Watch this walkthrough for changing plugs on Skyactiv 2.0 engines.Cost of Spark Plug Replacement for Mazda CX-3 (2016-2022)
The cost can vary depending on whether you do the job yourself or take it to a professional mechanic.
| Service | Estimated Cost |
|---|---|
| DIY (Parts Only) | $32 - $100 (for a set of 4 aftermarket plugs) |
| Professional Installation | $259 - $299 (includes parts and labor) |
Frequently Asked Questions
When should I replace the spark plugs on my Mazda CX-3?
Mazda's official maintenance schedule recommends replacing the spark plugs every 75,000 miles under normal driving conditions.
Is replacing the spark plugs a DIY job?
Yes, for many owners with basic tools, this is a very manageable DIY task. 🎬 Watch: Step-by-step spark plug and coil pack replacement guide. The spark plugs are easily accessible after removing the engine cover and ignition coils. You will need a 14mm thin-walled spark plug socket, a torque wrench, and an 8mm socket.
Do I need to gap the new spark plugs?
Most high-quality Iridium plugs from brands like NGK and Bosch come pre-gapped from the factory. It is best not to try to adjust the gap on these fine-wire plugs, as you can easily damage the delicate tip. It's always a good idea to verify the gap with a feeler gauge, but do not force it.
Should I use anti-seize on the new spark plug threads?
No. NGK, the OEM manufacturer, explicitly advises against using anti-seize on their plugs. The plugs have a special trivalent plating that prevents seizing. Using anti-seize can cause you to over-torque the plug, potentially damaging the threads in your engine's cylinder head.
Are there any recalls for the Mazda CX-3 spark plugs?
No, as of early 2026, there are no specific recalls or technical service bulletins (TSBs) from Mazda or the NHTSA for spark plug issues on the 2016-2022 CX-3.
Helpful Videos
Technical Specifications
OEM Part Numbers: PE5R-18-110 PE5R-18110A
Material: Iridium, OEM Brand: NGK, Corresponding NGK Part: ILKAR7L11, Socket Size: 14mm Thin Wall
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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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