BMW 645ci Cabin Filter (Microfilter) Replacement – 6 Series E63/64

bmw e63 cabin filter

BMW 645ci Cabin Filter Replacement – 15 Minutes

bmw 645ci cabin filter replacement

The BMW Repair Guide used this 2005 645ci for the following article. To see other repairs on our site using this actual car, please click on the image below!

A BMW 645ci cabin filter replacement is one of the easiest maintenance items you can do. And it’s also one of the most profitable for a dealership’s service department.

Dealership’s love doing the easy maintenance items on your bimmer. Cabin filter (also referred to as a microfilter) replacements are easy money for dealership service departments; they make money by selling you a “genuine BMW cabin filter” and on the 15 minutes it takes to replace them. In fact it takes more time pulling the vehicle in the service garage and opening the hood than it does changing the filters.

There is absolutely no need to pay for a genuine factory filter when doing a BMW 645ci cabin filter replacement. There are a plethora of “generic” filters on the market that do the exact same job as the factory filter and cost a fraction of the price. And paying the dealership for labor to replace them is a sin in itself…it will take you a total of 15 minutes to replace them on your own.

“A BMW 645ci cabin filter replacement is one of the easiest maintenance items you can do.”

The BMW Repair Guide suggests performing a cabin filter replacement on your 6 series vehicle every 30,000 miles to keep the interior of your vehicle fresh. We also suggest using a charcoal filter to help neutralize any foul odors. If you suffer from allergies, there are plenty of hypoallergenic filters on the market that you can substitute for the stock charcoal type if you prefer.

Parts, Tools and Supplies

6-series cabin filters (charcoal activated)(2 required)

Tools and Supplies
Flat blade screwdriver
8mm hex socket
3/8″ inch socket wrench

  1. Locate the two cabin filter plastic containers under the hood, in front of the e63 cabin filter
  2. Use a flat blade screwdriver to release the metal clip securing the side of the plastic e63 cabin filter
  3. Using an 8mm hex socket, turn the plastic retaining bolt counterclockwise until it releases the plastic container from the engine e63 cabin filter
  4. Remove the plastic container with the cabin e63 cabin filter
  5. Remove the cabin filter and replace with new one. Note that the cabin filter should be installed with the air flow arrow pointing up (away from the plastic container).bmw e63 cabin filter bmw e63 cabin filter
  6. Note – On the right side (passenger side) cabin filter container, you will need to remove the electrical connection from the hood switch before removing the container. bmw e63 cabin filter
  7. Reinstall plastic containers.

Installation finished
If you have any questions or comments, please feel free to contact us. And congratulations for Doing It Yourself!



The Repair Difficulty Level displays graphically how challenging the repair is, from easy to advanced. Easy repairs usually require very few tools, have short repair times and do not require jacking and supporting the vehicle. As the difficulty level rises, expect the repair to demand more time, specialized tools, and better understanding of mechanics to complete the job.