Audi Q3 Spark Plugs: Intervals, Fitment & Warning Signs

On the Q3, a coil pack replacement on related models genuinely hasn't always fixed a misfire, with worn plugs turning out to be the actual cause.

Generation covered: this guide is for the third-generation Q3 (F3, 2018–present), with particular focus on 2018–2023 registered examples now old enough for parts to be a common search. 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 91898 / Bosch 0 241 245 673

Accuracy note: Covers the Audi Q3 (F3 2018 on) 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	35 TFSI 150 HP; 40 TFSI 180 HP; 40 TFSI quattro 186 and 190 HP; 45 TFSI quattro 230, 231 and 245 HP; RS Q3 2.5 quattro 400 HP; 35 TFSI mild hybrid 150 HP; 45 TFSI e 245 HP
Spark plugs (aftermarket)	NGK 91898 (iridium, 16 mm hex, M14x1.25); NGK 94712 (iridium, gap 0.7 mm, M14x1.25); NGK 95929 (iridium, gap 0.8 mm, M12x1.25); NGK 97861 (platinum, gap 0.8 mm, M12x1.25); Bosch 0 241 245 673 (gap 0.7 mm, M14x1.25); Bosch 0 241 245 677 (gap 0.65 mm, M14x1.25); Bosch 0 241 145 525 (gap 0.75 mm, M12x1.25); Champion OE246 (iridium, gap 0.8 mm, M14x1.25)
Genuine (OE) numbers quoted	VAG 05E905602 listed as an OE part
Fitment notes	The list mixes M12x1.25 and M14x1.25 plugs with no engine codes against them, so the plug depends on the engine; iridium is the norm.

Audi Q3 Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems

The Audi Q3'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.

Audi Q3 Spark Plugs: What They Do

On the Audi Q3, 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.

Audi Q3 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, as this model is offered exclusively with four-cylinder petrol engines

Audi Q3 Spark Plugs: Watch: Replacing It

🎬 Watch: AUDI Q3 2.0T 2015 SPARK PLUGS REPLACEMENT (older gen)

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8U Q3 2.0T; no F3 video found

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A Genuinely Useful Piece of Context Worth Knowing About Persistent Misfires — Audi Q3 Spark Plugs

If a coil pack replacement hasn't resolved a persistent misfire, this is genuinely worth knowing: documented cases on related Audi models describe a coil pack replaced for a specific cylinder's misfire, only for worn or carbon-fouled spark plugs to turn out to be the actual cause instead.

A genuinely useful, money-saving diagnostic technique worth trying first: swapping a suspect coil with the coil from a different cylinder and seeing whether the misfire follows it is considerably cheaper than buying a new replacement coil outright on a hunch.

It's also genuinely worth knowing that failing to fully click the rear coil pack connectors back into place is a frequently documented cause of a misfire appearing immediately after fitting new coils, and that mixing coils from different sources rather than replacing them all together has been documented causing ongoing misfires.

Audi Q3 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 Audi Spark Plugs

The same part, covered across other Audi models.