Cabin and Engine Air Filters: Cheap Parts That Matter

By Ravi Castellano · Published Sep 6, 2026 · 4 min read

In this guide

Engine air filter
Cabin air filter
Changing them yourself
Upgrade options
Check during servicing

Your car has two air filters that are easy to forget: one cleans air going into the engine, the other cleans air coming into the cabin.

Both are inexpensive and affect performance, comfort, and health.

Engine air filter

This filter stops dust and debris entering the engine. A very dirty filter can reduce performance. Replacement intervals vary; dusty conditions shorten them considerably.

Cabin air filter

The cabin filter cleans air entering the interior through the vents, trapping dust, pollen, and pollution. A clogged one reduces airflow, can cause musty smells, and makes windows slower to demist.

Changing them yourself

On many cars, the cabin filter is behind the glovebox and the engine air filter is in a box under the bonnet held by clips. Your owner’s manual or a vehicle-specific video usually shows the steps.

Upgrade options

Activated-carbon cabin filters can reduce odours and some gases, which helps in heavy traffic. Check that any filter fits your model exactly.

Check during servicing

Ask your garage to show you the old filters if they recommend replacement — it is a quick way to see whether it was due.

This is general automotive information, not professional mechanical advice. Always follow your vehicle manufacturer’s specifications and service schedule, and have brakes, steering, tyres, and other safety-critical systems inspected by a qualified mechanic.

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