Audi A5 Coupe Cabin Air Filter: Intervals, Fitment & Warning Signs

On the A5, most Audis genuinely have the filter behind the glovebox, but a few models place it under the windscreen cowl instead.

Generation covered: this guide is for the second-generation A5 Coupe (F5 platform, 2016–2024) — the two-door coupe discontinued when Audi renamed the A4 saloon to A5 in 2024. These are entirely different cars despite sharing a name; if your car is a four-door saloon or estate bought new since 2024, this guide does not apply to it. Check your logbook or VIN if you're unsure which car you have.

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Easy to Forget, Easy to Fix

There's no performance downside to a neglected Audi A5 Coupe 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.

OEM Part Number: confirm via VIN — cabin air filter (aftermarket) Febi 100365 / Valeo 715851

Accuracy note: Covers the Audi A5 Coupe (F5 2016-2024) 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 100365, Valeo 715851, Blue Print ADV182530, Filtron K1378
Activated-carbon version (aftermarket)	Filtron K 1378A, Febi 48541, Blue Print ADV182529
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.

Audi recommends replacing this filter roughly every 12 months or 10,000-15,000 miles. It's a straightforward DIY job on the A5 Coupe, typically accessed behind the glovebox.

Audi A5 Coupe Cabin Air Filter: Watch: Replacing It

🎬 Watch: Audi A5 F5 cabin air filter replacement A5 F5 pollenfilter wechseln

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Audi A5 Coupe Cabin Air Filter reference plate

Audi A5 Coupe Cabin Air Filter: What It Does

Don't confuse this with the Audi A5 Coupe'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 Important Clarification Worth Confirming Before Buying a Filter — Audi A5 Coupe Cabin Air Filter

This is genuinely worth confirming before ordering a replacement: most Audis use a front-access method with the filter positioned behind the glovebox, but a small number of models instead place the filter under the cowl at the base of the windscreen — worth confirming which specific location applies to your car before buying, since the part and fitting procedure are completely different between the two.

A genuinely useful, preventative finding worth knowing: consistently using the recirculation setting rather than fresh air mode helps keep the evaporator dry, which can prevent musty smells and mould developing in the first place. It's also genuinely worth knowing a useful technique for an existing smell: setting the heater to high with recirculation on and letting the car idle for around fifteen minutes can help bake an existing smell out of the evaporator.

It's also genuinely worth knowing to check the plenum area below the windscreen for a build-up of leaves and debris, since this is a regularly documented source of water finding its way into the cabin.

Audi A5 Coupe 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 Audi Cabin Air Filter

The same part, covered across other Audi models.