Toyota GT86 Spark Plugs: Intervals, Fitment & Warning Signs
On the GT86, 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 2477 / Bosch 0 242 129 525
| Petrol engines in this generation | 2.0 (ZN6) 203 HP; 2.0 (ZN6AC, ZN6BC) 200 HP; 2.0 (ZN6EY) 207 HP |
|---|---|
| Spark plugs (aftermarket) | Denso ZXE27HBR8 (iridium centre, platinum earth, M12x1.25, 26.5 mm reach, alt. VXEBH27); NGK 2477 (iridium, M14x1.25, 19 mm reach, hex 16); Denso IK20TT (iridium, platinum earth, M14x1.25, 19 mm reach); Bosch 0 242 129 525 (gap 0.9 mm, M12x1.25, 26.5 mm reach, hex 16); Bosch 0 242 140 519 (gap 0.7 mm, M12x1.25, 19 mm reach, hex 16); Beru UPT12P (platinum, gap 0.75 mm, M14x1.25, hex 16); Ridex 686S0028 (iridium, gap 0.7 mm, M14x1.25) |
| Genuine (OE) numbers quoted | Denso ZXE27HBR8 = 22401AA801; Denso K20TT = 1WT318110 |
| Fitment notes | The Denso ZXE27HBR8 with OE 22401AA801 is the Subaru/Toyota boxer-engine reference (M12x1.25 thread, iridium); the other M14x1.25 plugs listed are generic cross-fitment items and no plug is tied to an engine code, so confirm by engine. Copper is not listed (nickel plugs appear for some Ridex/Denso items) |
A Genuinely Valuable Diagnostic Technique Worth Knowing — Toyota GT86 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 GT86 Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems
On the Toyota GT86, there's rarely a clear signal when spark plugs wear out — just a rougher idle, marginally less pep off the line — vague enough to get pinned on other engine issues. Since the part costs so little, it's also one of the easiest things to keep putting off.
Toyota GT86 Spark Plugs: Watch: Replacing It
Covers GT86 plus its Subaru/Scion twins (same FA20 engine).
Toyota GT86 Spark Plugs: What They Do
On the Toyota GT86, combustion efficiency, fuel economy and smooth running all trace back to spark plug condition, since these are what ignite the compressed fuel-air mixture in each cylinder. Petrol engines depend on them entirely — diesels skip spark plugs altogether, igniting fuel through compression instead.
Toyota GT86 Spark Plugs: Generations & Spark Plug Count
| Diesel variants | 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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Toyota GT86 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.