Peugeot 508 Spark Plugs: Intervals, Fitment & Warning Signs

If your 508 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 97968 / Bosch 0 242 135 518

Accuracy note: Covers the Peugeot 508 (2011-2018) 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	1.6 165 HP, 1.6 THP 150 HP, 1.6 THP 156 HP, 1.6 VTi 116 HP, 1.6 VTi 120 HP
Spark plugs (aftermarket)	NGK 97968 (iridium, 14 mm bi-hex, M12x1.25); NGK 91530 (platinum, 14 mm bi-hex, M12x1.25); Bosch 0 242 135 518 (0.7 mm gap, 14 mm hex, M12x1.25); Bosch 0 242 129 512 (0.95 mm gap, 14 mm hex); Champion CET16P (platinum, 0.75 mm gap, 14 mm bi-hex); Champion OE205 (platinum, 0.7 mm gap, 14 mm bi-hex); Denso VXUH22I and IXUH22FTT (iridium centre, platinum earth); Beru Z529 (iridium centre, platinum earth, 0.8 mm gap, 14 mm bi-hex). Engine-code fitment is not specified for individual plugs.
Genuine (OE) numbers quoted	Peugeot/Citroen 1654517280 (iridium, 0.8 mm gap); 9802840180 (0.8 mm gap); 5960.L5; 5960.G4; Denso VXUH22I cross-references A0041592503; Kamoka 7090014 cross-references 12 12 0 034 677; Kamoka 7090013 cross-references 0 034 098
Fitment notes	All listed plugs are 14 mm hex, M12x1.25, 26.5 mm reach, in platinum or iridium; gaps run 0.7 to 0.8 mm for the THP and VTi engines. No copper plugs are listed. No change interval is shown.

A Genuine, Real Phenomenon Worth Understanding: LSPI on Turbo PureTech Engines — Peugeot 508 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 508 Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems

The Peugeot 508'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.

Peugeot 508 Spark Plugs: Watch: Replacing It

🎬 Watch: Peugeot 508 1 6 THP Wypadanie zapłonów, brak mocy - Forté Polska (non-English)

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Polish; 508 1.6 THP misfire diagnosis (no 508 spark plug change video found)

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

Peugeot 508 Spark Plugs: What They Do

On the Peugeot 508, 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.

Peugeot 508 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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Peugeot 508 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.