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

A genuine technical warning about engine temperature before removing the C-Max's plugs, plus why real-world owners rarely wait for the full interval.

Illustration for editorial purposes

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OEM Part Number: confirm via engine code — aftermarket NGK 96870 / Bosch 0 242 236 683

Accuracy note: Covers the Ford C-Max (2010-2019) 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 EcoBoost 100 and 125 HP; 1.5 EcoBoost 150 and 182 HP; 1.6 EcoBoost 150 and 182 HP; 1.6 Ti 85, 105, 120, 125 HP; 2.0 Energi and Plug-in Hybrid; 1.6 CNG, LPG and Flexifuel variants
Spark plugs (aftermarket)	NGK 96870 (iridium, M14x1.25, 16 mm); NGK 94769 (iridium, 16 mm); NGK 6509 (iridium, 16 mm); NGK 2467 (platinum, 16 mm); NGK 91924 (iridium, M12x1.25, 14 mm); NGK 93593 (iridium, 14 mm); NGK 1511 (LPG/CNG, 60,000 km); Bosch 0 242 236 683 (gap 0.8 mm, 16 mm, 15 Nm)
Genuine (OE) numbers quoted	Denso ITV22 = 1698597
Fitment notes	The M12x1.25 14 mm iridium plugs (NGK 91924 and 93593, Ridex 686S0129, Bosch 0 242 145 573) are the EcoBoost-style fit, while the M14x1.25 16 mm plugs suit the 1.6 Ti engines

Before You Start, a Genuine Technical Warning — Ford C-Max Spark Plugs

Worth knowing before attempting this yourself on the Ford C-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 C-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 C-Max Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems

Worn spark plugs on the Ford C-Max rarely announce themselves clearly — a slightly rougher idle, a bit less punch off the line — symptoms easy to blame on almost anything else in the engine bay. The part itself costs very little, which makes it an easy one to overlook for far longer than it should be.

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

Ford C-Max Spark Plugs: Watch: Replacing It

🎬 Watch: How To Change Spark Plugs - FORD C-Max

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Generation not stated in title

Ford C-Max Spark Plugs: What They Do

The Ford C-Max's spark plugs ignite the compressed fuel-air mixture inside each cylinder, and their condition directly affects combustion efficiency, fuel economy and smooth running. Petrol engines rely entirely on them; diesel engines don't use spark plugs at all, relying on compression instead.

Ford C-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 C-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.