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

A genuinely honest finding: this filter's exact location genuinely varies by model, sometimes in the engine bay above the battery, sometimes behind the glovebox — 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) Mann CU25002 / Bosch 1987435058

Accuracy note: Covers the Mercedes-Benz C-Class (W205 2014-2021) 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)	Mann CU25002, Bosch 1987435058, Febi 38781, Valeo 715751
Activated-carbon version (aftermarket)	Bosch 0 986 628 596, Mann FP29005, Febi 105817
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 C-Class Cabin Air Filter: Easy to Forget, Easy to Fix

There's no performance downside to a neglected Mercedes-Benz C-Class cabin filter, which is precisely the problem: nothing about how the car drives will tell you it needs changing, so it often gets forgotten until a musty smell or weak airflow 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.

Mercedes-Benz C-Class Cabin Air Filter: What It Does

Don't confuse this with the Mercedes-Benz C-Class's engine air filter — they're unrelated parts. The cabin filter's job is cleaning air before it reaches the ventilation system, catching dust and pollen, with activated-carbon versions also filtering some airborne odours.

Mercedes-Benz C-Class Cabin Air Filter: Watch: Replacing It

🎬 Watch: Mercedes C-Class W205 Pollen Filters Replacement (Step-by-Step Guide)

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Mercedes-Benz C-Class Cabin Air Filter reference plate

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A Genuinely Honest, Real Finding Worth Knowing — Mercedes-Benz C-Class 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, with some cars having it positioned in the engine bay right above the battery, while others have it behind the glovebox, or behind the front passenger footwell panel instead. Worth confirming which specific location applies to your particular car, perhaps by checking the owner's handbook or a model-specific guide, rather than assuming it isn't fitted simply because you can't find it in the first place you look.

A genuinely honest, real 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 and not discoloured, still suffering from an extremely persistent, unpleasant musty smell. If a smell is noticeable even without the blower running, simply on opening the car door, this points strongly toward the evaporator or a blocked condensate drain tube as the actual cause, rather than the filter itself.

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, rather than simply a dirty filter needing replacement.

Mercedes-Benz C-Class 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.