Yes, you can sue a dealership for selling you a bad car in Wisconsin. There are a few different ways you can go about this, depending on the specific circumstances of your case.

One option is to file a lawsuit in small claims court. This is a relatively simple and inexpensive process, and it's a good option if the amount of money you're seeking is relatively small. To file a small claims lawsuit, you'll need to fill out a form and file it with the court. You'll also need to serve the dealership with a copy of the lawsuit.

Another option is to file a lawsuit in regular court. This is a more complex process, and it can be more expensive. However, it may be the best option if the amount of money you're seeking is significant. To file a lawsuit in regular court, you'll most likely need to hire an attorney. Make sure you read reviews on a lawyer from prior clients; it will help ensure you hire the right lawyer. 

No matter which option you choose, it's important to gather evidence to support your case. This could include things like repair bills, estimates from mechanics, and documentation of the dealership's promises or representations about the car.

If you're successful in your lawsuit, you could be awarded damages for the cost of repairs, the loss of use of the car, and other expenses. You could also be awarded punitive damages, which are designed to punish the dealership for their wrongdoing.

If you're considering suing a dealership for selling you a bad car, it's a good idea to speak with an attorney to discuss your options. An attorney can help you assess your case and determine the best way to proceed.

Attorney Nathan DeLadurantey offers free consultations to explain your legal rights in Wisconsin. Free consultations can be scheduled online.