Cabin Air Filter

It is recommended to replace the Cabin Air Filter every year or 15,000 miles. Follow this link to see the instructions; http://bit.ly/db7ss8

I have a 2000 S500. There are four cabin filters total, two fresh air, and two charcoal filters. They are accessed be removing the trim panel under the passenger side of the dash, the plastic panel up under the dash past the carpet trim under the glove compartment door. The charcoal filters are behind one door, and the fresh air filters behind another. You have a W220 chassis. If you google "w220 cabin filter replacement" or something similar you will find lots of good instructions from do-it-yourselfers.