Seat Leon Spark Plugs: Intervals, Fitment & Warning Signs
On the Leon, VW Group has replaced coil packs under recall on related models for free — worth checking directly, plus a real repeat-failure case worth understanding.
Illustration for editorial purposes
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OEM Part Number: confirm via engine code — aftermarket NGK 91898 / Bosch 0 241 245 673
| Petrol engines in this generation | 1.0 TSI 86 and 115 HP, 1.2 TSI 86, 105 and 110 HP, 1.4 TSI 122, 125, 140 and 150 HP, 1.5 TSI 130 and 150 HP, 1.6 SRE 110 HP, 1.8 TSI 180 HP, 2.0 TSI 190 HP, 2.0 Cupra 265, 280, 290, 300 and R 310 HP; CNG 1.4 TGI 110 HP and 1.5 TGi 131 HP |
|---|---|
| Spark plugs (aftermarket) | NGK 91898 (iridium, 16 mm hex, M14x1.25); NGK 95929 (iridium, 0.8 mm gap, M12x1.25); NGK 94224 (iridium, 0.8 mm gap, M12x1.25); NGK 95463, 93231, 97124 and 97861 (platinum, M12x1.25); NGK 94833 (platinum, M14x1.25); NGK 3850 (nickel, 19 mm hex, M14x1.25); Bosch 0 241 245 673 (0.7 mm gap, M14x1.25); Bosch 0 241 245 677 (0.65 mm gap, M14x1.25) |
| Genuine (OE) numbers quoted | Kamoka 7090007 cross-references 06K 905 601 B |
| Fitment notes | Both M12x1.25 and M14x1.25 plugs appear, all 16 mm hex apart from the NGK 3850 at 19 mm; the 06K 905 601 B family (M14x1.25, platinum or iridium, about 0.65 to 0.7 mm gap) suits the 1.4, 1.5, 1.8 and 2.0 TSI engines, so confirm by engine. No change interval is shown. |
Confirmed: A Genuine VW Group Coil Pack Recall Exists on Related Models — Seat Leon Spark Plugs
Worth checking directly with your dealer: VW Group has carried out coil pack recalls on various makes and models sharing this platform, with owners confirming a full set replaced free of charge on their Octavia and six coils replaced free on an Audi A4. If you're experiencing repeated coil failures, it's genuinely worth asking specifically whether an outstanding recall exists for your particular car, since this could resolve the cost of what might otherwise be an expensive repeat repair.
Seat Leon Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems
On the Seat Leon, 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.
Seat Leon Spark Plugs: Watch: Replacing It
Leon Mk3 5F 1.4 TSI
Seat Leon Spark Plugs: What They Do
On the Seat Leon, 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.
Seat Leon Spark Plugs: Generations & Spark Plug Count
| Diesel variants | Not applicable — diesel engines use compression ignition and have no spark plugs at all |
|---|---|
| 1.0 TSI (entry petrol trims, where fitted) | Genuinely only 3 spark plugs — confirm your exact engine before ordering, since this generation spans both 3-cylinder and 4-cylinder petrol options |
| 1.5/2.0 TSI (mid to higher trims, vRS) | 4 spark plugs — a genuinely different, larger four-cylinder engine from the entry-level 3-cylinder unit |
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Seat Leon 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 Seat Spark Plugs
The same part, covered across other Seat models.