Audi A3 Cabin Air Filter: Intervals, Fitment & Warning Signs

A genuinely important clarification: most Audis have the filter behind the glovebox, but a few models place it under the windscreen cowl instead — worth confirming which applies to your car before buying, since the part and procedure are entirely different.

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OEM Part Number: confirm via VIN — cabin air filter (aftermarket) Mahle LA888 / Bosch 1987432540

Accuracy note: Covers the Audi A3 (8V 2012-2020) 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)	Mahle LA888, Bosch 1987432540, Febi 48465, Blue Print ADV182526
Activated-carbon version (aftermarket)	Mahle LAK 888, Bosch 0 986 628 630, Febi 39048
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 A3 Cabin Air Filter: Easy to Forget, Easy to Fix

Unlike most parts covered on this Audi A3 guide, this one has no bearing on how the car drives or performs — its only job is air quality inside the cabin, which makes it very easy to forget about entirely until something 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.

Audi A3 Cabin Air Filter: What It Does

The Audi A3's cabin air filter cleans incoming air before it reaches the ventilation system, trapping dust, pollen and, on activated-carbon versions, some airborne odours and pollutants. It has no connection to the engine air filter, which is a completely separate part serving the combustion process rather than the cabin.

Audi A3 Cabin Air Filter: Watch: Replacing It

🎬 Watch: Audi A3/S3/RS3 (8V) cabin air filter replacement DIY

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Audi A3 Cabin Air Filter reference plate

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A Genuinely Important Clarification Worth Confirming Before Buying a Filter — Audi A3 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 itself and the 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 from developing in the first place — one owner documented having zero smell issues across their last two cars by doing this consistently, having previously had smell problems on an earlier car where fresh air mode was used more often. 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 relatively quickly.

It's also genuinely worth knowing to check the plenum area, the cover visible below the windscreen when the bonnet is open, for a build-up of leaves and debris, since this is a regularly documented source of water finding its way into the cabin, leading to a wet carpet and musty smell that's easily mistaken for a simple filter problem.

Audi A3 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.