Hyundai i30 Spark Plugs: Intervals, Fitment & Warning Signs
A genuinely distinctive, real case: ceramic plug cracking and coil failures recurred four separate times on the same car — plus an absurd, real dealer response refusing warranty because the light wasn't on that day.
Illustration for editorial purposes
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OEM Part Number: confirm via engine code — aftermarket NGK 93102 / Bosch 0 242 135 554
| Petrol engines in this generation | 1.0 T-GDI, 1.4 MPI, 1.4 T-GDI, 2.0 N (N Performance) |
|---|---|
| Spark plugs (aftermarket) | NGK 93102 (iridium, 0.8 mm gap, 16 mm hex, M12x1.25); NGK 97312 (iridium, 0.7 mm gap, M12x1.25); NGK 95448 (iridium, 0.9 mm gap, 28 mm thread); NGK 97098 (iridium, M12x1.25); Bosch 0 242 135 554 (1.1 mm gap, M12x1.25); Bosch 0 242 145 510 (0.7 mm gap, M12x1.25); Denso ZXU20HPR11 (iridium/platinum, M12x1.25); Denso VXUH20I (iridium/platinum, M12x1.25) |
| Genuine (OE) numbers quoted | Denso ZXU20HPR11 (OE 09482-00629) |
| Fitment notes | Every plug is 16 mm hex M12x1.25 and almost all are iridium, with Champion OE197/T10 and OE201/T10 the only copper options (0.9 mm gap). Champion OE250 shows M14x1.25 and is the odd one out. No change interval is shown and no plug is tied to an engine code. |
A Genuinely Distinctive, Real Case Worth Knowing About — Hyundai i30 Spark Plugs
This is genuinely worth knowing if you're facing a recurring plug or coil fault that seems to keep coming back despite repairs: one documented case saw ceramic spark plugs cracking and causing misfires, alongside ignition coil failures, recur four separate times on the same car, with each instance replaced under warranty only for the fault to return within weeks or a few hundred kilometres. If you're facing a similar recurring pattern rather than a genuine one-off failure, it's worth pushing a dealer to investigate why the fault keeps returning rather than simply replacing the same parts again each time.
It's also worth knowing a genuinely useful, honest technical distinction: unlike spark plugs, which are a genuine, expected consumable wear item, ignition coils are not considered a standard wear-and-tear part — if a dealer tries to dismiss a coil failure as simply expected wear, it's worth knowing this distinction and pushing for warranty consideration rather than accepting that framing, particularly on a car that's still within its warranty period.
Hyundai i30 Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems
On the Hyundai i30, 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.
Hyundai i30 Spark Plugs: Watch: Replacing It
3rd-gen i30.
Hyundai i30 Spark Plugs: What They Do
On the Hyundai i30, 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.
Hyundai i30 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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Hyundai i30 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 Hyundai Spark Plugs
The same part, covered across other Hyundai models.