Peugeot 108 Spark Plugs: Intervals, Fitment & Warning Signs

If your 108 has the PureTech engine, a genuine, real phenomenon explains knocking under load — plus real, documented confusion over the correct plug part number.

Illustration for editorial purposes

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OEM Part Number: confirm via engine code — aftermarket NGK 97999 / Bosch 0 242 129 529

Accuracy note: Covers the Peugeot 108 (2014-) as listed in the UK aftermarket catalogues. Spark plugs are engine-specific — thread size (M12 vs M14), reach, heat range, electrode type (copper, platinum, iridium) and gap all change between engines in the same car, and the catalogue listings below cover every petrol engine in the generation without always saying which plug fits which. Match the plug to your engine code (on the V5C or the engine cover), fit a full set of the same type, and use the maker's gap and torque. Genuine numbers are shown only where a listing quotes one.

Petrol engines in this generation	1.0 VTi 69 HP; 1.0 VTi 72 HP; 1.2 82 HP
Spark plugs (aftermarket)	NGK 97999 (iridium, 5 kOhm suppressor, M12x1.25, 16 mm hex); NGK 5989 (iridium, 5 kOhm suppressor, M12x1.25, 14 mm hex); Bosch 0 242 129 529 (gap 1.1 mm, M12x1.25, 14 mm hex); Bosch 0 242 129 525 (gap 0.9 mm, M12x1.25, 16 mm hex); Denso SC16HR11 (iridium centre, platinum earth, M12x1.25); Denso IXUH22I (iridium, M12x1.25, 16 mm hex); Champion OE261 (iridium, gap 0.7 mm, M12x1.25, 14 mm hex)
Genuine (OE) numbers quoted	Citroen/Peugeot 1611548180 (platinum, resistor), also quoted against Kamoka 7100010; Denso FC16HR-Q8 against 90919-01289; Denso IXUH22I against 90048-51189-000; Kamoka 7100053 against 9091901253; Denso VXUH22I against A0041592503; Renault 224015145R and 224019133R as OE parts
Fitment notes	All are three-cylinder M12x1.25 plugs, either 14 mm or 16 mm hex, so the hex size has to be matched; iridium types run a 0.7-1.1 mm gap.

A Genuine, Real Phenomenon Worth Understanding: LSPI on Turbo PureTech Engines — Peugeot 108 Spark Plugs

If your car has a PureTech turbocharged petrol engine and you're experiencing a knocking or misfiring sensation specifically under load at low engine speed, it's worth knowing about Low Speed Pre-Ignition (LSPI) — a genuine, industry-recognised phenomenon affecting small, turbocharged direct-injection engines generally, not something unique to Peugeot. It occurs when the fuel-air mixture ignites prematurely, before the spark plug fires, causing a knock that can potentially damage the engine over time if it happens repeatedly. Genuinely useful to know: LSPI is understood to be exacerbated by certain oil additive packages, and switching to an oil that meets the correct, current specification for this engine — combined with using a higher-octane fuel, which some owners report noticeably reduces the frequency of the knock — are the cheapest, simplest first steps worth trying.

A genuinely confusing, real fitment detail worth checking carefully: there's documented confusion among both parts suppliers and owners about the correct spark plug for this engine — some sources list the ZR5 heat range as the current Bosch-recommended part, while many retailers still show the ZR6 as standard, with owners speculating Bosch may have revised their recommendation at some point without this being consistently reflected across every parts catalogue. Given how sensitive these small turbo engines can be to using the wrong heat-range plug, it's genuinely worth cross-checking your specific engine code against your VIN via a specialist parts lookup rather than assuming the first result from a generic search is correct.

Peugeot 108 Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems

A worn set of spark plugs in the Peugeot 108 doesn't make itself obvious: idle roughens slightly, acceleration loses a bit of urgency, and both symptoms are easy to blame on something else entirely. Given how inexpensive the part is, it often gets neglected for far longer than it should.

Peugeot 108 Spark Plugs: Watch: Replacing It

🎬 Watch: 1.0 Peugeot 107 Citroen C1 Toyota Aygo - Oil Air Filter and Spark Plug Service How To DIY (sister (Peugeot 107 / Citroen C1 / Toyota Aygo))

Watch on YouTube ↗

The 108 shares the 1.0 engine with these cars. No 108-specific video found; the 107 version is the older generation.

Before you buy: plug type and gap specification vary by engine size and generation. Always confirm against your VIN before ordering.

Peugeot 108 Spark Plugs: What They Do

Every combustion cycle in the Peugeot 108's petrol engine starts with a spark plug igniting the compressed fuel-air mixture, and their condition shapes efficiency, economy and smoothness directly. Diesel versions don't need them at all, relying purely on compression to ignite fuel.

Peugeot 108 Spark Plugs: Generations, Engines & Spark Plug Count

Diesel variants (BlueHDi)	Not applicable — diesel engines use compression ignition and have no spark plugs at all
1.2 PureTech/THP (standard petrol trims)	Genuinely only 3 spark plugs — this engine is shared across the wider PSA/Stellantis range (Peugeot, Citroen, DS), not a four-cylinder
GTI/GT (1.6 THP, where fitted)	4 spark plugs — the performance derivative uses a genuinely different, larger four-cylinder engine from the standard car's 3-cylinder unit

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Peugeot 108 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 Peugeot Spark Plugs

The same part, covered across other Peugeot models.