Mazda CX-3 Spark Plugs: Intervals, Fitment & Warning Signs
On the CX-3, repeatedly removing coil boots to "just check" plugs genuinely risks a microscopic scratch modern ignition systems can't tolerate.
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OEM Part Number: confirm via engine code — aftermarket NGK 6283 / Bosch 0 242 135 529
| Petrol engines in this generation | 1.5 SKYACTIV-G (DK2W) and other petrol and petrol/ethanol variants; diesel also listed |
|---|---|
| Spark plugs (aftermarket) | NGK 6283 (iridium, M12x1.25, 14 mm hex); NGK 4912 (iridium, M12x1.25, 14 mm hex); NGK 1654 (iridium, M12x1.25, 14 mm hex); NGK 94124 (iridium, M12x1.25, 14 mm hex); Denso IXEH22TT (iridium centre, platinum earth, M12x1.25); Denso ZC20HPR11 (iridium centre, platinum earth, M12x1.25; OE P51R-18-110); Champion OE253 (iridium, 1.0 mm gap, M12x1.25, 14 mm hex) |
| Genuine (OE) numbers quoted | Denso ZC20HPR11 = P51R-18-110 |
| Fitment notes | The SKYACTIV-G petrol takes an M12x1.25 / 14 mm hex iridium plug with a 1.0 to 1.1 mm gap; the M14x1.25 / 16 mm plugs in the list (such as NGK 2477 and 7060) belong to other engines, and the plugs are not tied to individual engine codes. No change interval is given. |
A Genuinely Important, Counter-Intuitive Warning Worth Knowing — Mazda CX-3 Spark Plugs
This is genuinely worth knowing before repeatedly pulling plugs to "just check" them: every time a coil and boot is removed and reinstalled, there's a genuine risk of causing a microscopic scratch on the plug's porcelain insulator. On modern engines, this risk is considerably higher than on older cars — leaner fuel mixtures and wider plug gaps mean today's ignition systems require far higher voltage, meaning a tiny scratch that would once have gone unnoticed can now genuinely cause a misfire.
It's also worth knowing a genuinely useful diagnostic distinction: finding oil specifically on the threads of a newly fitted spark plug points toward a valve cover gasket or seal leak, rather than a fault with the plug or coil itself.
Mazda CX-3 Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems
The Mazda CX-3's spark plugs rarely fail dramatically; they just quietly degrade, showing up as a rougher idle or slightly blunted acceleration that gets blamed on other things. The part costs next to nothing, which paradoxically makes it one of the most commonly neglected items under the bonnet.
Mazda CX-3 Spark Plugs: Watch: Replacing It
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Mazda CX-3 Spark Plugs: What They Do
On the Mazda CX-3, the compressed fuel-air mixture in each cylinder is ignited by the spark plugs, and their condition feeds directly into combustion efficiency, fuel economy and how smoothly the engine runs. Only petrol engines use them; diesels rely on compression alone.
Mazda CX-3 Spark Plugs: Generations & Spark Plug Count
| Diesel variants, where fitted | Not applicable — diesel engines use compression ignition and have no spark plugs at all |
|---|---|
| Petrol variants (all trims) | 4 spark plugs — one per cylinder |
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Mazda CX-3 Spark Plugs: Warning Signs, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Spark Plugs Guide for symptoms of worn plugs, why matching your exact plug specification matters, and trusted brands to buy from.
More Mazda Spark Plugs
The same part, covered across other Mazda models.