You may not realize it, but is more than one air filter attached to your car. Not only do you have the filter near your engine, but there is also one located within the vehicle itself. This is used to collect any dust or other particles that are in the vehicle. Many people don't realize it, but these need to be replaced every year or two. So in this tutorial, you'll find out how to locate and replace the cabin airfilter on a 2004 Honda Civic. good luck and enjoy!