Ford B-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 won't always fix.

Illustration for editorial purposes

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OEM Part Number: confirm via VIN — cabin air filter (aftermarket) Febi 34894 / Valeo 715660

Accuracy note: Covers the Ford B-Max (2012-2017) 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)	Febi 34894, Valeo 715660, Blue Print ADM52518, Filtron K1251
Activated-carbon version (aftermarket)	Febi 34895, Blue Print ADF122505, Filtron K 1251A
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: the filter's printed physical dimensions (length, width, depth) are the most reliable way to confirm fitment on a B-Max if you're unsure of your exact model year, since the part is defined more by its housing size than by model name alone.

A Genuinely Useful Tip Beyond Just Replacing the Filter — Ford B-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 B-Max Cabin Air Filter: Easy to Forget, Easy to Fix

Of everything covered for the Ford B-Max, this is about as low-stakes mechanically as it gets — it doesn't touch how the car drives at all. Its only job is cabin air quality, which is exactly why owners tend to ignore it until something makes that hard to do.

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 B-Max Cabin Air Filter: Watch: Replacing It

🎬 Watch: Replace Cabin Filter Ford B-Max 2012-2017

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Ford B-Max Cabin Air Filter reference plate

Ford B-Max Cabin Air Filter: What It Does

On the Ford B-Max, this filter sits in the ventilation intake, not the engine bay, and cleans the air reaching the cabin — trapping dust, pollen, and on carbon-activated versions, some odours and pollutants too. The engine air filter is a completely different part, serving combustion rather than the cabin.

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Ford B-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.