The Wisconsin lemon law covers any motor driven vehicle that (1) is required to be registered or is exempt from registration as a nonresident or foreign-registered vehicle, and (2) a consumer purchases or accepts transfer of in Wisconsin. This includes a demonstrator or executive vehicle, but does not include mopeds, semitrailers, or trailers designed for use in combination with a truck or truck tractor.

The lemon law does not cover previously-owned vehicles.