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.

Illustration for editorial purposes

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OEM Part Number: 5Q0819669

Accuracy note: this part is genuinely consistent across the whole 8V range regardless of engine or trim, since it's part of the HVAC system rather than the drivetrain.

Cabin air filter, 8V generation (2013-2020), standard particulate filter	Audi OEM: 5Q0819644A — shared with Q3, TT, TTS, RS3, S3, and same-era VW/Skoda/Seat MQB models
Cabin air filter, 8V generation (2013-2020), activated carbon/charcoal filter	Audi OEM: 5Q0819653 — a genuinely different filter media from the standard version, confirmed fitted across the same range depending on original spec
Current combined reference	Audi OEM: 5Q0819669 is commonly listed as a combined/superseding reference for either type — check which specific filter your car has fitted rather than assuming from the number alone

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 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.