Pansexual means someone is attracted to a person of any sex or any gender. It does not require a beleive in "automobiles are a sex" or attraction to automobiles.
While of course many pansexuals may believe in neosexes/genders it is not a defining quality of pansexuality. Pan sexuality is basically just bi-sexuality but with explicit inclusion of trans people and others who are more than just simply "male or female" in that they have other descriptors that are needed to fully describe their gender expression.