I went through the same thing today. Dad thought that the air filter in the 2002 Ranger was just fine, with soot and dirt filling up the pleats. Mom said to replace it, so I did. Fram Tough Guard BTW. I swear that truck goes through air filters more than any other vehicle. It constantly sits in bad traffic, with a lot of big trucks around, and the air filter gets dirty quick. My truck, with the same air filter and air filter housing as the 2002 does not get nearly as dirty nearly as quick, but it is driven on rural roads with few other vehicles around.