Mercedes-Benz A-Class Cabin Air Filter: Intervals, Fitment & Warning Signs
On the A-Class, 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: A2478300604
| Cabin air filter (combifilter, with built-in activated carbon layer) | Mercedes-Benz OEM: A2478300604 — shared with same-generation CLA and GLA; current Mercedes filters commonly combine standard particulate filtration and activated carbon into one part rather than offering them as two separate filters |
|---|---|
| Older Mercedes generations (pre-2010s, historical note) | A genuinely separate second activated-charcoal filter was fitted only on cars with dual-zone or higher climate control options, in addition to the primary dust filter fitted to every car — current combifilter designs have superseded this two-filter approach |
Mercedes-Benz A-Class Cabin Air Filter: Easy to Forget, Easy to Fix
There's no performance downside to a neglected Mercedes-Benz A-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.
Mercedes-Benz A-Class Cabin Air Filter: What It Does
Don't confuse this with the Mercedes-Benz A-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.
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A Genuinely Honest, Real Finding Worth Knowing — Mercedes-Benz A-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 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.
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 A-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.