A BMW 328i typically has two air filters: one for the engine air intake and one for the cabin ventilation.
Across its several generations—spanning models like the E46, E90, F30, and later variants—the standard setup includes both an engine air filter and a cabin air filter. The engine filter protects the combustion process, while the cabin filter keeps interior air clean. Locations and replacement intervals can vary slightly by year and market, but two filters is the common configuration.
Two main air filters in the 328i
Below are the two filters most owners will encounter, with where to find them and what they do.
Engine air filter
Where it sits and what it does.
- Location: In the air intake housing (the airbox) under the hood, typically toward the front of the engine bay.
- Function: Filters dust, debris, and other contaminants from the air before it enters the engine for combustion.
- Replacement interval: Common guidance is every 30,000–60,000 miles (48,000–96,000 km), depending on driving conditions and the exact engine variant. Always check the owner’s manual for the recommended interval.
Regular replacement of the engine air filter helps maintain engine performance, fuel efficiency, and longevity.
Cabin air filter
Location and purpose.
- Location: Behind the glove box or under the dashboard, depending on the model year and trim; access is usually via a service panel.
- Function: Traps pollen, dust, and other pollutants to improve interior air quality and HVAC performance.
- Replacement interval: Common guidance is every 15,000–30,000 miles (24,000–48,000 km) or at least once a year, though intervals can vary by model year and climate. Consult the owner’s manual for specifics.
Replacing the cabin filter as recommended helps maintain airflow through the HVAC system and keeps interior air fresh.
Summary
In short, the BMW 328i typically uses two air filters: one engine air filter and one cabin air filter. They are located in the engine compartment airbox and behind the glove box, respectively, with replacement intervals that vary by generation and usage. Always refer to the vehicle’s manual for exact guidance on maintenance intervals.
Can a bad air filter cause a misfire?
In extreme cases, an engine will run very roughly when its air filter is too dirty. A driver may notice their vehicle's engine misfiring, vibrating excessively, stalling, or a combination of these symptoms when the engine's air filter is clogged.
Where is the air filter in a BMW 328i?
So here's our N20 engine bay. And our air filter is going to be below here so yeah a little pro tip for you guys always get yourself some rubber gloves. That are disposable.
Does BMW have two air filters?
Virtually all modern cars have two car air filters – the engine air filter and the cabin air filter. Read on to compare the engine air filter vs cabin air filter. Then, come down to our dealership near Loveland where you can schedule services or even build your next BMW.
Why are used 328i so cheap?
What Are Used 328i So Cheap? BMWs have a high repair cost, making them hard to maintain for many people looking for a reliable, used vehicle. The used BMW market is also heavily saturated, making it harder to keep resale values up.