Mercedes-Benz GLA Cabin Air Filter: Intervals, Fitment & Warning Signs

On the GLA, this filter's exact location genuinely varies by model on related Mercedes cars — plus an account of a fresh filter not fixing a smell traced to the evaporator instead.

Illustration for editorial purposes

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OEM Part Number: confirm via VIN — cabin air filter (aftermarket, activated carbon) Mann CUK26007 / Febi 40422

Accuracy note: Covers the Mercedes-Benz GLA (X156 2014-2020) 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)	No reliable aftermarket reference found for this generation — order against your VIN
Activated-carbon version (aftermarket)	Mann CUK26007, Febi 40422, Blue Print ADN12546
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.

Mercedes-Benz GLA Cabin Air Filter: Easy to Forget, Easy to Fix

Skipping this one on a Mercedes-Benz GLA won't cost you performance or reliability, only air quality inside the cabin — which is why it's routinely the most overdue item on any used car's maintenance history.

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.

Mercedes-Benz GLA Cabin Air Filter: What It Does

Two filters get mixed up constantly on the Mercedes-Benz GLA: this one cleans air for the cabin ventilation system, catching dust, pollen and (on activated-carbon versions) some airborne pollutants, while the separate engine air filter deals purely with combustion air. They don't share a part number or a purpose.

Mercedes-Benz GLA Cabin Air Filter: Watch: Replacing It

🎬 Watch: How to Change Air Cabin Filter Mercedes-Benz GLA 2014-2020 X156

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Mercedes-Benz GLA Cabin Air Filter reference plate

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A Genuinely Honest, Real Finding Worth Knowing — Mercedes-Benz GLA Cabin Air Filter

If you're struggling to find this filter, this is genuinely worth knowing: its exact location genuinely varies depending on the specific model year and generation on related Mercedes models, with some cars having it positioned in the engine bay, while others have it behind the glovebox, or behind the front passenger footwell panel instead.

A genuinely honest account worth knowing if a smell persists after replacing this filter: a documented case saw a car with the cabin filter changed less than 4,000 miles prior, confirmed clean, still suffering from a persistent musty smell — pointing strongly toward the evaporator or a blocked drain tube as the actual cause.

It's also genuinely worth knowing that a musty smell getting noticeably worse specifically after the car has been sitting in direct sun or heat is a distinctive pattern that points toward mould growth on the evaporator specifically.

Mercedes-Benz GLA 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 Mercedes-Benz Cabin Air Filter

The same part, covered across other Mercedes-Benz models.