Ford B-Max Spark Plugs: Intervals, Fitment & Warning Signs

A genuine technical warning about engine temperature before removing the B-Max's plugs, plus why owners often change these well ahead of schedule.

Illustration for editorial purposes

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OEM Part Number: confirm via engine code — aftermarket NGK 93593 / Bosch 0 242 145 573

Accuracy note: Covers the Ford B-Max (2012-2017) 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	See the fitment notes
Spark plugs (aftermarket)	NGK 93593 (iridium, M12x1.25, 14 mm); NGK 6509 (iridium, M14x1.25, 16 mm); NGK 2467 (platinum, 16 mm); NGK 4559 (nickel, 16 mm); NGK 96463 (nickel, 16 mm); NGK 1511 (iridium, LPG/CNG, 60,000 km); Bosch 0 242 145 573 (gap 0.7 mm, M12x1.25, 14 mm, 15 Nm); Bosch 0 242 236 675 (gap 0.7 mm, M14x1.25, 16 mm)
Genuine (OE) numbers quoted	Denso T16VR-U10 = 1493001
Fitment notes	Two families are listed: the M14x1.25 16 mm plugs for the 1.4 and 1.6 Duratec/Sigma engines and the M12x1.25 14 mm iridium plugs (NGK 93593, Bosch 0 242 145 573) for the 1.0 EcoBoost; NGK 1511 is the LPG plug with a 60,000 km interval.

A Genuine Technical Warning Worth Knowing First — Ford B-Max Spark Plugs

Worth knowing before attempting this yourself on the Ford B-Max: spark plugs should never be removed when the engine is either hot or fully cold-soaked (sat unused overnight) — the engine needs to be warm to the touch after cooling down for a period first. Removing plugs at the wrong temperature risks damaging the thread or the cylinder head itself, a considerably more expensive problem than the plug replacement you started with. On EcoBoost engines specifically, the aluminium cylinder head makes this more of a genuine risk than on some older, simpler engines — over-tightening or working at the wrong temperature can strip threads that are more delicate than cast iron.

On anti-seize compound: opinion is genuinely split even among experienced mechanics. Manufacturers including NGK generally advise against it on modern plugs, which come pre-coated with a corrosion-resistant plating designed to prevent seizing without it — adding anti-seize can alter the effective torque by up to 20%, risking thread damage or a stretched plug shell that changes its heat rating. That said, many long-term owners report using a small amount without issue, particularly on higher-mileage engines where thread corrosion is more of a concern. If in doubt, following the plug manufacturer's specific guidance for your exact plug is the safer default.

It's also worth knowing that Ford's official spark plug interval for the B-Max (often around 100,000 miles on EcoBoost engines) is considerably longer than what many real-world owners actually do in practice — a meaningful number report changing plugs at 40,000-60,000 miles instead, citing noticeably improved throttle response and fuel economy, particularly on turbocharged engines that work the plugs harder than a naturally-aspirated equivalent. This isn't a hard rule, but if you're noticing a rough idle or slightly longer crank time on an EcoBoost with plugs approaching official end-of-life, fresh plugs are a cheap thing to try before assuming a more expensive fault.

Ford B-Max Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems

A worn set of spark plugs in the Ford B-Max 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.

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

Ford B-Max Spark Plugs: Watch: Replacing It

🎬 Watch: Ford Focus 1.0 EcoBoost Spark Plug Change DIY (sister (Ford Focus Mk3))

Watch on YouTube ↗

No B-Max video; same 1.0 EcoBoost engine

Ford B-Max Spark Plugs: What They Do

Every combustion cycle in the Ford B-Max'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.

Ford B-Max 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 standard trims)	4 spark plugs — one per cylinder

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Ford B-Max 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 Ford Spark Plugs

The same part, covered across other Ford models.