Toyota Aygo Spark Plugs: Intervals, Fitment & Warning Signs
On the Aygo, a genuinely valuable diagnostic technique: swapping a coil to a different cylinder reveals whether it's genuinely faulty.
Illustration for editorial purposes
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OEM Part Number: confirm via engine code — aftermarket NGK 5989 / Bosch 0 242 129 529
| Petrol engines in this generation | 1.0 (KGB40) 69 HP; 1.2 (PAB40) 82 HP |
|---|---|
| Spark plugs (aftermarket) | NGK 5989 (iridium, hex 14, M12x1.25); NGK 96210 (iridium, gap 0.8 mm, hex 14); Bosch 0 242 129 529 (gap 1.1 mm, hex 14); Bosch 0 242 129 525 (gap 0.9 mm, hex 16); Denso VXUH22I (iridium Power, hex 16); Denso FC16HR-Q8 (iridium/platinum); Champion CCH9412 (iridium, gap 1.0 mm, hex 14); Champion OE261 (iridium, gap 0.7 mm, hex 14). No plug is tied to a particular engine code. |
| Genuine (OE) numbers quoted | Denso FC16HR-Q8 = 90919-01289; Denso VXUH22I = 90048-51189-000 (also quoted A0041592503); Renault 224015145R and 224019133R are listed as OE-part plugs. |
| Fitment notes | Both the 1.0 (KGB40) and 1.2 (PAB40) engines are served by the same range of 14 mm hex M12x1.25 iridium plugs (NGK 5989 / 96210, Denso FC16HR-Q8, Champion CCH9412 / OE261); engine-specific fitment is not given, so confirm by engine code. No copper or laser plugs are listed |
A Genuinely Valuable Diagnostic Technique Worth Knowing — Toyota Aygo Spark Plugs
If you're getting a persistent misfire fault code pointing to a specific cylinder and want to confirm whether the coil itself is genuinely at fault, this is worth trying: physically swap the coil from the suspect cylinder with a coil from a different cylinder position, then clear the codes and drive again. If the fault code now follows the coil to its new position, the coil itself is genuinely faulty. If the fault code stays with the original cylinder position, the coil isn't the problem.
It's also worth knowing about a genuinely real, somewhat distinctive pattern: an intermittent misfire that seems to worsen specifically in wet weather, and settles down after sitting in a dry garage overnight, often points toward moisture affecting a connector rather than a genuine fault with the coil or plug itself.
Toyota Aygo Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems
The Toyota Aygo'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.
Toyota Aygo Spark Plugs: What They Do
On the Toyota Aygo, 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.
Toyota Aygo Spark Plugs: Generations & Spark Plug Count
| All petrol variants (1.0 VVT-i) | Genuinely only 3 spark plugs — the Aygo is built exclusively around Toyota's (Daihatsu-designed) three-cylinder 1.0-litre engine across the entire range, shared with the closely related Citroen C1 and Peugeot 108 |
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Toyota Aygo 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 Toyota Spark Plugs
The same part, covered across other Toyota models.