Ford Focus Mk3 Cabin Air Filter: Intervals, Fitment & Warning Signs

Access genuinely differs by Focus generation — here's the notoriously tight Mk3 method versus the simpler design on later cars.

Generation covered: this guide is for the third-generation Focus, built 2011–2018 (commonly the 2014–2018 registered examples still in daily use). The newer Mk4 Focus (2018–) uses different part numbers throughout — check your V5C logbook or VIN if you're unsure which generation you have.

Illustration for editorial purposes

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Access Genuinely Differs by Generation — Worth Knowing Before You Start

The Mk3 Focus (roughly 2011-2018) has a notoriously tight access point: the filter sits vertically behind the glovebox area, and reaching it means removing a soft trim panel plus a hard plastic cover, generally with a Torx T20 or T25 driver. Because the filter sits vertically and the floorboard is in the way, it won't slide out in a straight line — you'll need to gently compress or "accordion" the filter to work it free of the slot, and note the airflow arrow on the old filter before discarding it (on the Mk3, air generally flows from front to rear). Later Focus models moved to a considerably more user-friendly, traditional location directly behind the glovebox — simply dropping the glovebox door down on its side dampeners gives direct access to the filter tray, no trim removal required. If your Focus feels unexpectedly awkward to access compared to a guide you're following, checking which generation the guide actually covers is worth doing first.

Common UK-spec replacement filters: Mann Filter CU 22018 and Bosch 1987435011 are both widely stocked, confirmed-compatible options — always cross-check against your specific filter's dimensions before ordering, since Ford revised the specification more than once across the Focus's production run.

Ford Focus Mk3 Cabin Air Filter: Easy to Forget, Easy to Fix

On the Ford Focus Mk3, this part sits in an unusual category: neglecting it changes nothing about how the car drives, so there's no natural prompt to replace it. It only affects the air you're breathing inside the cabin, which is why it's so often left well past its interval.

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.

Ford Focus Mk3 Cabin Air Filter reference plate

OEM Part Number: CV6Z-19N619-A

Accuracy note: unlike most parts on this site, the cabin air filter is genuinely consistent across nearly the entire Mk3 range — the same filter fits regardless of engine, since it's part of the HVAC system rather than the drivetrain.

Standard cabin air filter (2012–2018, all engines)	Ford OEM / Motorcraft: CV6Z-19N619-A
Activated-carbon "odour filter" upgrade	Ford UK part 1354953 — same fitment, added carbon layer for exhaust/odour filtering

Ford recommends replacing this filter roughly every 12 months or 15,000 miles. The upgraded activated-carbon version fits in exactly the same place and is worth the small extra cost if you regularly drive in heavy traffic or notice exhaust smells entering the cabin.

Ford Focus Mk3 Cabin Air Filter: What It Does

Every bit of air blown through the Ford Focus Mk3's cabin vents passes through this filter first, which is what traps dust and pollen — plus some odours and pollutants if it's an activated-carbon type. It has nothing to do with the engine air filter, a wholly separate component built for the combustion side of things.

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Ford Focus Mk3 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 Ford Cabin Air Filter

The same part, covered across other Ford models.