Lexus IS Cabin Air Filter: Intervals, Fitment & Warning Signs

A genuinely useful, real preventative tip: switching to fresh air mode a few minutes before you park, rather than only after, helps dry out condensation and reduce musty smells — plus an honest clarification about what full evaporator cleaning actually involves.

Illustration for editorial purposes

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OEM Part Number: confirm via VIN — cabin air filter (aftermarket) Mann CU2345 / Bosch 1987432075

Accuracy note: Covers the Lexus IS (2013-) 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)	Mann CU2345, Bosch 1987432075, Valeo 715631, Filtron K1060
Activated-carbon version (aftermarket)	Mann FP 2345, Bosch 0 986 628 619, Filtron K 1060A
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.

Lexus IS Cabin Air Filter: Easy to Forget, Easy to Fix

There's no performance downside to a neglected Lexus IS cabin filter, which is precisely the problem: nothing about how the car drives will tell you it needs changing, so it often gets forgotten until a musty smell or weak airflow 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.

Lexus IS Cabin Air Filter: What It Does

Don't confuse this with the Lexus IS's engine air filter — they're unrelated parts. The cabin filter's job is cleaning air before it reaches the ventilation system, catching dust and pollen, with activated-carbon versions also filtering some airborne odours.

Lexus IS Cabin Air Filter: Watch: Replacing It

🎬 Watch: Replace Lexus IS Cabin Air Filter, 2014-2021

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Lexus IS Cabin Air Filter reference plate

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A Genuinely Useful, Real Preventative Tip Worth Trying — Lexus IS Cabin Air Filter

If you're trying to prevent musty smells developing, this is genuinely worth trying: setting the airflow to external or fresh air mode for a few minutes before you actually arrive at your destination and switch the car off, rather than only doing this after parking, helps dry out condensation trapped in the vents and can genuinely reduce musty smells over time.

A genuinely honest clarification worth knowing: cleaning the evaporator itself, rather than simply replacing the cabin filter, isn't a simple task, since in most cases the entire dashboard has to be removed to access it — worth having this done at a workshop rather than attempting it yourself.

It's also genuinely worth knowing that a smell isn't always filter or mould-related at all: pets, or even wildlife getting into the car if it's not parked in a garage, can introduce an odour that's easily mistaken for a dirty filter or evaporator issue — worth ruling this out before assuming a more involved cause.

Lexus IS 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 Lexus Cabin Air Filter

The same part, covered across other Lexus models.