Audi A6 Cabin Air Filter: Intervals, Fitment & Warning Signs

On the A6, most Audis genuinely have the filter behind the glovebox, but a few models place it under the windscreen cowl instead.

Illustration for editorial purposes

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OEM Part Number: 4H0819439

Genuinely worth knowing: C7 and C8 generation filters sit in different locations in the car, and owners have directly reported that C8 how-to videos are hard to find since most guides online cover the older C7 — confirm your generation before following a repair video, since the removal procedure isn't the same.

C7 generation (2011-2018), cabin air filter	Audi OEM: 4H0819439 — shared with A7, A8, RS7, S6, S7, S8
C8 generation (2019 onwards), cabin air filter	Audi OEM: 4M0819439B — also cross-referenced as 4M0819439A, 4M0819439C

Audi A6 Cabin Air Filter: Easy to Forget, Easy to Fix

Of everything covered for the Audi A6, this is about as low-stakes mechanically as it gets — it doesn't touch how the car drives at all. Its only job is cabin air quality, which is exactly why owners tend to ignore it until something makes that hard to do.

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 A6 Cabin Air Filter: What It Does

On the Audi A6, this filter sits in the ventilation intake, not the engine bay, and cleans the air reaching the cabin — trapping dust, pollen, and on carbon-activated versions, some odours and pollutants too. The engine air filter is a completely different part, serving combustion rather than the cabin.

Audi A6 Cabin Air Filter reference plate

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A Genuinely Important Clarification Worth Confirming Before Buying a Filter — Audi A6 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 A6 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.