Originally Posted by
wptski
The cabin air filter is "optional".
Yes, "optional" to install yourself. Under the cowl on the passenger side where the outside air enters the vehicle. You can if you want put a filter in there. My 2003 has ths space for a filter. If you search around you can find the one that will fit. When I first checked this filter compartment there wasn't any filter installed. I see no need for a filter, so I left well enough alone.