Your model Honda may be equipped with a Pollen Filter and over time it will need to be changed (just like the filter in your home ventilation system). An old filter may contain pollen, fungus and or mold. Over time it may effect the performance of your air conditioning and heating system as well as omitting a strange odor. So if there is not wet dog in your car, it may just just be your pollen filter. Replaced with a Genuine Honda Filter.