How to Replace the Cabin Air Filter on a Mercedes-Benz W163 M-Class

Replacing the cabin air filter on the Mercedes-Benz M-Class W163 is a relatively simple maintenance procedure that can usually be completed with basic hand tools. The cabin air filter is located in the interior of your SUV, on the passenger-side footwell. The job can typically be completed in about 5–15 minutes, depending on access and the condition of the trim and filter housing. Follow these easy step-by-step instructions on changing the cabin air filter. This procedure applies to the Mercedes-Benz M-Class W163, including ML320, ML430, ML350, ML500, and ML55 AMG models from the applicable 1998–2005 model years. Filter specifications can vary by production number, so verify the correct filter for your vehicle before ordering. While many car owners forget to change the cabin air filter, inspect the cabin filter at regular service intervals and replace it when it becomes dirty, restricted, or develops an odor. Vehicles operated in dusty or polluted environments may require more frequent replacement.

The filter for the ML-Class W163 costs less than $20; see the link here to get one from Amazon. If you go to a mechanic or the dealer, you will be charged well over $100 for this 5-minute job.

Tools and parts required

Torx driver/socket as required for the lower dash fasteners
Replacement cabin air filter
Optional: vacuum cleaner for removing leaves and debris from the filter housing

Instructions on how to change the cabin air filter.

Remove the fasteners securing the lower passenger-side dashboard/footwell cover, then lower the cover to access the cabin-filter housing.
Lower the passenger-side footwell trim panel. Then release the retaining tab on the cabin-filter access cover and remove the cover.
Press on the locking tab and pull down the filter door cover.
Pull down the interior cabin filter and note its orientation. If the replacement filter has an airflow-direction arrow, install it according to the arrow and the filter manufacturer’s instructions. Inspect the filter housing and remove loose leaves, dust, and debris before installing the new filter. Avoid pushing debris farther into the HVAC housing.
Push the new air filter in place.
Press the cabin air filter door into place.
Reinstall the cover under the instrument panel.
After installation, reinstall the trim panels and operate the HVAC blower. Confirm that airflow is normal and that there are no unusual noises from the blower.

Part Numbers

Cabin Filter Part Number: A 163 835 00 47
Previous/replaced number: A 163 835 02 47

Mercedes-Benz used production/identification-number cutoffs for some W163 parts. Because the applicable filter can depend on production configuration, use the VIN or chassis/identification number to confirm the correct part.