BMW F3x Cabin Filter Replacement – 2012-2019 3 and 4 Series Microfilter

BMW F3x Cabin Filter Replacement – 30 Minutes
Basic level repair
Repair cost level 1

The BMW Repair Guide used this 2014 F30 BMW 320i for the following article.

Repair Summary
The following article gives detailed instructions on replacing the cabin air filter (microfilter) in a BMW F3x vehicle. Even though we have used a 2014 BMW 320i to perform this installation, this article can be applied to any 2012-2019 3 or 4 series vehicle with minor modifications.

A BMW F3x cabin filter (microfilter) replacement will help restore fresh clean air to the interior of your 3 or 4 series vehicle.

One of the most overcharged dealership maintenance items on a BMW is replacing the cabin air filter, also known as the micro-filter. They are notoriously easy to replace and are very inexpensive to purchase.

The BMW F3x cabin filter does exactly as its name implies; it filters the fresh air being drawn into the interior cabin of your 3 or 4 series car through the heating, ventilation and air-conditioning (HVAC) system. It filters out dust, pollen and other air-borne contaminates as well as noxious odors. It is an extremely important component of your vehicle’s HVAC system and plays an important role in providing a fresh, comfortable, allergen free environment inside your BMW.

The BMW Repair Guide recommends replacing your BMW F3x cabin filter once a year. If you drive in an excessively contaminated environment (like a smog filled city or around heavy road construction) you may want to change it more often.

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1. Cabin air filter (required) – There are two different cabin air filters depending on whether you have automatic air conditioning or not. Very simply, if you have a button on your air conditioning controller that says “Auto”…then purchase the automatic air conditioning filter. If you don’t have the “Auto” button on your controls, then purchase the filter for non automatic air conditioning vehicles.

All BMW F3x 3 and 4 series with automatic air conditioning
All BMW F3x 3 and 4 series with automatic air conditioning
All BMW F3x 3 and 4 series without automatic air conditioning
Section 1 – Removing and installing the BMW F3x cabin filter

Removing and installing the cabin filter in your 3 or 4 series vehicle is very straightforward. The cabin filter is located inside the car, underneath the dashboard behind the glove box. We recommend putting the passenger seat back as far as it will go to give yourself enough room to remove an install the cabin filter.

  1. Locate the BMW F3x cabin filter. It is located on the passenger side of the vehicle underneath the glove f3x cabin filter - Filter located under the dashboard behind the glovebox.
  2. Using a 10mm socket wrench, remove the two mounting nuts securing the lower trim panel to the bottom of the dashboard. Grasp the trim panel and pull it f3x cabin filter - Lower dash panel mounting nutsPull the trim panel down
  3. Disconnect the power accessory outlet and the footwell light. Remove the trim panel from the f3x cabin filter - Disconnect the power accessory outlet bmw f3x cabin filter - Disconnect the footwell light
  4. Locate the black cabin filter housing under the dashboard. It has a cover on it that is held in place with two torx screws.
  5. Using a T15 torx bit or torx key, remove the two screws securing the cabin filter cover. Remove the cover from the housing. You can now see the cabin f3x cabin filter - Remove the torx screws from the lid of the filter housing bmw f3x cabin filter - Remove the torx screws from the lid of the filter housing Pull the lid off of the filter housing
  6. Grasp the cabin filter and pull it out of the f3x cabin filter - Pull the cabin filter out of the housing
  7. Install a new cabin filter and reassemble the vehicle following the above instructions in reverse. Pay particular attention to the front of the trim panel when reinstalling…the plastic tabs on the trim panel must line up with the slots in the dashboard. Failure to line them up correctly could cause the tabs to break f3x cabin filter - Make sure the trim panel tabs line up with the dashboard.


BMW F3x Cabin Filter Replacement Finished
If you have any questions or comments, please feel free to contact us. And congratulations for Doing It Yourself!