Dacia Duster Spark Plugs: Intervals, Fitment & Warning Signs

A genuine fitment trap: NGK replacement coils are rated 14V versus the original 12V Hitachi units — plus a specific, real fix for water found inside the plug wells.

Generation covered: this guide is for the first-generation (2010–2017) and second-generation (2017–2024) Duster — not the brand-new third-generation Duster launched in late 2023/2024, which is too recent for this guide and uses different parts throughout. Check your logbook or VIN if you're unsure which generation you have.

Illustration for editorial purposes

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OEM Part Number: confirm via engine code — aftermarket NGK 91121 / Bosch 0 242 135 517

Accuracy note: Covers the Dacia Duster (Mk2 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	1.0 TCe 91 HP, 1.0 TCe 101 HP (HMMT), 1.2 TCe 125 HP (HMMA), 1.3 TCe 150 HP (HMM3), 1.3 TCe 131 HP (HMMF), 1.6 SCe 115 HP (HMM1); 4x4 and LPG variants also listed
Spark plugs (aftermarket)	NGK 91121 (iridium, M12x1.25, 14 mm); NGK 90061 (iridium, 14 mm); NGK 90912 (iridium, gap 0.7 mm, 14 mm); NGK 94951 (nickel, 14 mm); Bosch 0 242 135 517 (gap 0.7 mm, 14 mm); Bosch 0 241 140 537 (gap 0.7 mm); Bosch 0 242 129 510 (gap 0.9 mm); Denso IXEH22TT and IXEH22FTT (iridium, platinum earth)
Genuine (OE) numbers quoted	Kamoka 7100016 = Renault 22 40 191 33R
Fitment notes	iridium suits the TCe turbo engines while copper (Champion OE130/T10, Ridex 686S0053) suits the naturally aspirated 1.6 SCe. Plugs are not tied to individual engines. No change interval shown.

A Genuine Fitment Trap Worth Knowing Before Ordering Replacement Coils — Dacia Duster Spark Plugs

If you're replacing ignition coils and considering NGK as an alternative to the original fitment, this is genuinely worth knowing: one documented case found NGK replacement coils specified as 14V, while the original factory-fitted Hitachi units were rated at 12V — a genuine voltage mismatch that may explain compatibility issues some owners have experienced when mixing brands. If you're troubleshooting new coils that aren't behaving correctly, checking this specific voltage rating against your original units before assuming a faulty batch or a coding issue is worth doing.

A genuine, specific fix worth knowing if you find water inside the spark plug wells: this is a real, documented cause of misfiring, and the fix is specific — disconnect the coil connector, remove the retaining bolt carefully (don't drop it into the well), and allow the well and coil around 15 minutes to dry out completely. While waiting, remove, clean, and check the gap on the spark plugs themselves, then clean the coil's connector contacts with proper electrical contact cleaner before refitting everything. This addresses the actual moisture rather than simply replacing parts that may not be genuinely faulty.

It's also worth knowing why 3-cylinder engines (like the SCe65 fitted to some models) often have a shorter plug replacement interval than you might expect on a low-mileage car: with fewer cylinders sharing the workload, each spark plug fires more frequently per crankshaft revolution than it would in a comparable 4-cylinder engine, accelerating wear even at modest annual mileage. This is why the manufacturer's schedule may specify a plug change every 4 years regardless of how few miles you've covered — it genuinely reflects real wear cycles, not just a calendar-based guess.

Dacia Duster Spark Plugs: Watch: Replacing It

🎬 Watch: Dacia Duster Spark plug change

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Generation not stated in title; Mk2 1.3 TCe info at https://www.youtube.com/watch?v=EOAUUela80w

Dacia Duster Spark Plugs reference plate

Dacia Duster Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems

The Dacia Duster'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.

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

Dacia Duster Spark Plugs: What They Do

On the Dacia Duster, 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.

Dacia Duster Spark Plugs: Generations, Engines & Spark Plug Count

Diesel variants (dCi)	Not applicable — diesel engines use compression ignition and have no spark plugs at all
0.9/1.0 TCe/SCe (standard petrol trims)	Genuinely only 3 spark plugs — this small turbocharged engine (co-developed with Nissan) is shared across Renault, Dacia and even some Smart models, not a four-cylinder
1.3 TCe (higher trims, RS Line and similar)	Genuinely 4 spark plugs — this larger engine (co-developed with Mercedes-Benz) is a completely different unit from the smaller 3-cylinder TCe, despite both sharing the "TCe" badge; confirm your exact engine before ordering

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Dacia Duster 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 Dacia Spark Plugs

The same part, covered across other Dacia models.