Ford S-Max Cabin Air Filter: Intervals, Fitment & Warning Signs

A real disinfectant trick clears a musty smell from the ductwork itself — something a fresh filter alone often won't fully fix.

Illustration for editorial purposes

Find Ford S-Max Cabin Air Filter Here!

Opens live listings in a new tab.

OEM Part Number: confirm via VIN — cabin air filter (aftermarket) Mahle LA1138 / Bosch 1987435142

Accuracy note: Covers the Ford S-Max (2015-) as listed in the UK aftermarket catalogues. A cabin filter is a cheap part, but it is bought by number, and the number depends on whether your car was built with a standard particulate filter or an activated-carbon one, as well as on trim and build date. The references below are aftermarket catalogue listings for this generation, grouped by brand; the carmaker's own number is not quoted in those listings, so check the genuine filter against your VIN if you want a guaranteed match. Carbon versions carry their own numbers and are listed separately.

Cabin filter, standard (aftermarket)	Mahle LA1138, Bosch 1987435142, Blue Print ADF122533, Hengst E3992LI
Activated-carbon version (aftermarket)	Mahle LAK 1138, Bosch 0 986 628 586, Hengst E3992LB
Genuine (OE) number	Not quoted in the catalogue listings — the fitted filter varies by trim and build date, so order the genuine one against your VIN
Fitment notes	Standard and carbon filters have different numbers, and the right size depends on trim and build date. Check which type your car was built with before ordering.

Accuracy note: genuinely worth knowing: S-Max cabin filters are usually one of the easiest DIY jobs on the car — often just a clip-out panel behind the glovebox — but the physical dimensions can change between facelifts of the same model, so a part that fits an early S-Max won't always fit a later one.

A Genuinely Useful Tip Beyond Just Fitting a New Filter — Ford S-Max Cabin Air Filter

If you're changing the filter specifically because of a musty smell, it's worth going one step further: after fitting the new filter, spray a can of disinfectant (a household product like Dettol works well) into the intake vents, then run the fans on full with heat at maximum in recirculation mode for several minutes with windows and doors closed. This helps sterilise mould and mildew that can build up through the entire duct network and heater box, not just the filter itself — simply replacing the filter alone doesn't always fully resolve a persistent musty smell if the ductwork itself has mildew growth. Leaving the air conditioning running periodically rather than switching it off entirely also helps keep the system dry and less prone to this in the first place.

Ford S-Max Cabin Air Filter: Easy to Forget, Easy to Fix

Unlike most parts covered on this Ford S-Max guide, this one has no bearing on how the car drives or performs — its only job is air quality inside the cabin, which makes it very easy to forget about entirely until something forces the issue.

Before you buy: filter size and whether your car uses a standard or activated-carbon filter varies by trim. Always confirm against your VIN before ordering.

Ford S-Max Cabin Air Filter: Watch: Replacing It

🎬 Watch: Ford S-MAX and Galaxy (2006 - 2015) - Replace the pollen filter

Watch on YouTube ↗

This video is of an earlier generation of the same model; the filter job is similar but the cover and clips can differ slightly.

Ford S-Max Cabin Air Filter reference plate

Ford S-Max Cabin Air Filter: What It Does

The Ford S-Max's cabin air filter cleans incoming air before it reaches the ventilation system, trapping dust, pollen and, on activated-carbon versions, some airborne odours and pollutants. It has no connection to the engine air filter, which is a completely separate part serving the combustion process rather than the cabin.

Find Ford S-Max Cabin Air Filter Here!

Opens live listings in a new tab.

Ford S-Max Cabin Air Filter: Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Cabin Air Filter Guide for signs it needs changing, confirming fitment against your VIN, and choosing standard, carbon, or HEPA media.

More Ford Cabin Air Filter

The same part, covered across other Ford models.