Mitsubishi ASX Cabin Air Filter: Intervals, Fitment & Warning Signs

On the ASX, a musty smell that genuinely survives a fresh filter often points toward mould on the evaporator itself, not the filter.

Illustration for editorial purposes

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OEM Part Number: 7803A004

Accuracy note: ASX shares its platform with the Outlander and Lancer, and genuinely shares this reference with them.

Cabin air filter	Mitsubishi OEM: 7803A004 (also referenced as 7803A005, 7803A109) — shared across ASX, Lancer, Outlander, Outlander Sport, Eclipse Cross
Activated carbon/charcoal alternative	A genuinely different filter media exists as an alternative to the standard particulate-only filter, using the same physical fitment

Mitsubishi ASX Cabin Air Filter: Easy to Forget, Easy to Fix

Of everything covered for the Mitsubishi ASX, 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.

Mitsubishi ASX Cabin Air Filter: What It Does

On the Mitsubishi ASX, 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.

Mitsubishi ASX Cabin Air Filter reference plate

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A Genuinely Useful Diagnostic Distinction Worth Knowing — Mitsubishi ASX Cabin Air Filter

If a musty smell survives fitting a fresh cabin filter, this is genuinely worth knowing: this often points toward mould on the evaporator itself rather than the filter, which a relatively cheap aerosol treatment can usually resolve rather than needing another filter change. A soaked, waterlogged filter, on the other hand, specifically indicates the scuttle panel or door seals are letting water past — worth finding and fixing this actual leak before the cabin carpet becomes a permanent, ongoing problem.

Worth knowing that dust bypassing a clogged or poorly-fitted filter can shorten the blower motor's life: that said, a blower motor going noisy or losing its top speed after years of use is more likely down to worn bearings or a failing resistor than the filter itself — worth having this checked separately if a fresh filter doesn't resolve reduced airflow.

It's also genuinely worth knowing that on related Mitsubishi models used in dusty or off-road conditions, the filter can block well ahead of the standard mileage-based interval, worth checking more frequently if your typical use is genuinely dusty rather than sticking rigidly to a schedule intended for normal road use.

Mitsubishi ASX 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 Mitsubishi Cabin Air Filter

The same part, covered across other Mitsubishi models.