Hi, this part is designed to fit the 2003 Sentra with the 1.8L engine only. Our records indicate that the 2003 Sentra was built with either the 1.8L or the 2.5L engine. If your Sentra has a 1.6L engine, chances are it is not a U.S. spec vehicle, and we do not have the air filter housing for it. We apologize for any inconvenience.