The Wisconsin Lemon Law came into effect from November 3, 1983 and is applicable to new vehicles (car, truck, motorcycle or motor home, to be precise), rented vehicles and all used vehicles that have been bought within the warranty period.

A quick glance at the major points of the Wisconsin Lemon Law throws up the following. In the first place, a vehicle is classified as "lemon" in Wisconsin if

- It has been bought or rented in Wisconsin,
- It is showing signs of strain within the first year of purchase
- It is showing signs of breaking down before the guarantee period has terminated,
- Within the first year of purchase or within the warranty period, four tries by the manufacturer has failed to fix its problems,
- It was non-functional for 30 days (need not be consecutive) during the first year of acquisition or within the warranty period.