Mini Countryman Cabin Air Filter: Intervals, Fitment & Warning Signs

A genuinely counterintuitive finding: removing the filters entirely eliminated a musty smell completely, only for it to return once new filters were installed — plus a genuine clarification that not every Mini has a cabin filter fitted, depending on trim level.

Illustration for editorial purposes

OEM Part Number: 64-31-9-127-516

Accuracy note: confirmed for 2007-2016 builds — this same reference is shared across Cooper, Countryman, Paceman, and Clubman body styles of the same era, since all use the same platform-generation HVAC housing.

Cabin air filter, 2007-2016 (without activated carbon)	Mini OEM: 64-31-9-127-516

Easy to Forget, Easy to Fix

Unlike most parts covered here, 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.

What It Does

The cabin air filter cleans incoming air before it reaches the car's 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.

Mini Countryman Cabin Air Filter reference plate

A Genuinely Counterintuitive, Real Finding Worth Knowing — Mini Countryman Cabin Air Filter

If a musty smell persists despite fitting fresh filters, this is genuinely worth knowing: documented cases describe removing the cabin filters entirely and having no smell whatsoever for several days, only for the smell to return immediately once new filters were installed — suggesting the filter itself may change airflow in a way that encourages condensation and mildew, rather than the smell simply being caused by a dirty filter.

A genuinely important clarification worth knowing: not every Mini has a cabin air filter fitted as standard, and for some models, whether one is fitted at all depends specifically on the trim level — worth confirming your exact specification before assuming a fault if you can't locate one.

It's also genuinely worth knowing an important diagnostic distinction: a specifically "burning oil" smell, rather than general mustiness, can actually be caused by a leaking valve cover gasket dripping onto the hot exhaust manifold, with the resulting vapour drawn in through the cabin air intake — a completely different, engine-related cause with nothing to do with the cabin filter itself.

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 Mini Cabin Air Filter

The same part, covered across other Mini models.

Mini Countryman Cabin Air Filter: Intervals, Fitment & Warning Signs

OEM Part Number: 64-31-9-127-516

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A Genuinely Counterintuitive, Real Finding Worth Knowing — Mini Countryman Cabin Air Filter