Under Wisconsin's Lemon Law (Wis. Stat. § 218.0171), a new vehicle is a "lemon" when a warranty defect that substantially impairs its use, value, or safety either (1) is subject to repair four or more times for the same problem and still is not fixed, or (2) keeps the vehicle out of service for a total of 30 or more days because of one or more warranty defects. The defect must first be reported to the manufacturer or its authorized dealer within one year after delivery of the vehicle (or within the term of the written warranty, whichever is sooner). If your vehicle meets either test, you, the consumer, get to choose between a comparable new replacement vehicle or a full refund, and the manufacturer must deliver it within 30 days of your written demand. This is one of the most consumer-friendly lemon statutes in the country, in part because a manufacturer that fails to comply can be ordered to pay double your damages plus your attorney fees.
Which vehicles and defects qualify in Wisconsin
The Wisconsin Lemon Law covers vehicles purchased or leased in Wisconsin that are still under the manufacturer's original express warranty. That includes new cars and trucks, demonstrators, and motorcycles. It also reaches some used vehicles, because the protection follows the original written warranty rather than the buyer — if a used car you bought is still inside the manufacturer's original warranty period and the one-year delivery window, it can still qualify. The statute does not cover the portion of a motor home used as a dwelling, mopeds, or semitrailers.
Not every annoyance is a qualifying "nonconformity." The defect must be covered by the warranty and must substantially impair the use, value, or safety of the vehicle. A persistent stalling problem, brake failure, transmission defect, or recurring electrical fault that the dealer cannot fix typically qualifies; a minor cosmetic blemish or something caused by your own abuse, neglect, or unauthorized modification generally does not.
The two triggers, explained
Wisconsin gives you two independent paths to lemon status, and you only need to satisfy one:
Four repair attempts. The same nonconformity has been presented for repair four or more times and the problem continues. Each visit should be documented with a repair order showing the date, mileage, the problem you reported, and what (if anything) the dealer did.
30 days out of service. The vehicle has been out of service for a cumulative total of at least 30 days because of warranty defects. These days do not have to be consecutive, and they can result from more than one defect.
Both triggers depend on the timing rule: the defect must have been first reported within one year of delivery or within the warranty term, whichever ends first. Reporting early protects you even if the repair runs long — what matters is when you first put the manufacturer or dealer on notice.
Refund or replacement — your choice
If your vehicle qualifies, you decide the remedy, not the manufacturer:
Comparable replacement vehicle. The manufacturer must provide a new vehicle comparable to the one you have, and refund any collateral costs (such as sales tax, title, and registration fees connected to the replacement).
Full refund. The manufacturer must refund the full purchase price plus any sales tax, finance charges, and collateral costs, minus a statutory "reasonable allowance for use."
That use allowance is calculated by a set formula, not by the manufacturer's guesswork. Under the statute it equals the full purchase price multiplied by the number of miles you drove before you first reported the defect, divided by 100,000. So if you reported the problem early and at low mileage, the deduction is small. For leased vehicles, the law has its own refund mechanics covering lease payments and amounts owed to the lessor.
Once you make a written demand and offer to return the vehicle (transferring title), the manufacturer has 30 days to comply. Missing that 30-day deadline is what exposes the manufacturer to the law's powerful penalties.
Enforcing your rights
Start by building a paper trail. Keep every repair order, your purchase or lease contract, the warranty booklet, and a log of dates the vehicle was in the shop. Then make your demand to the manufacturer in writing — certified mail with return receipt is wise — clearly stating that the vehicle qualifies under Wis. Stat. § 218.0171 and which remedy (refund or replacement) you elect.
Many manufacturers run a certified arbitration program (for example, BBB AUTO LINE). If the manufacturer has a qualified informal dispute-resolution program, you may need to go through it before suing on certain warranty claims; however, you are not required to accept an arbitration decision you find unfair, and you keep your right to file suit.
If the manufacturer does not deliver your refund or replacement within 30 days, you can sue in circuit court. Wisconsin's remedy is unusually strong: a consumer who prevails may recover double the amount of any pecuniary loss, together with court costs, disbursements, and reasonable attorney fees, plus equitable relief the court deems appropriate. Because attorney fees are recoverable, many consumers can hire a lemon-law attorney without paying out of pocket. There is a deadline to sue — the statute sets a limited window after the qualifying events — so act promptly and confirm the current limitations period before relying on it.
How Wisconsin compares to federal law
The federal baseline is the Magnuson-Moss Warranty Act, which governs written warranties nationwide and lets consumers recover attorney fees for breach of warranty. But Magnuson-Moss has no automatic "four repairs or 30 days" trigger and no built-in refund-or-replacement mandate. Wisconsin's Lemon Law layers those concrete triggers, the consumer's choice of remedy, the 30-day compliance clock, and double damages on top of the federal floor — giving Wisconsin buyers stronger, faster leverage than federal warranty law alone.
Where to verify and get help
Because statutes and deadlines change, confirm the current rules before acting. The Wisconsin Department of Transportation (DOT) publishes official Lemon Law guidance and a complaint process for vehicle owners. For broader consumer-protection enforcement, the Wisconsin Department of Justice, Office of the Attorney General, handles consumer fraud and unfair-trade-practice matters, and the Wisconsin Department of Agriculture, Trade and Consumer Protection (DATCP) operates the state's consumer-protection hotline and complaint system. Read the actual statute, Wis. Stat. § 218.0171, on the Wisconsin Legislature's website to confirm the exact figures and the current time limit to sue, and consider consulting a Wisconsin lemon-law attorney given the fee-shifting and double-damages provisions.
Official Wisconsin Sources
This page is based on Wisconsin law. Limits and deadlines change — verify the current details directly with the official Wisconsin sources below. This is general legal information, not legal advice.
Federal law also applies. Federal laws like the Fair Debt Collection Practices Act and Fair Credit Reporting Act protect you nationwide, on top of Wisconsin’s own rules.
Frequently asked questions
How many repair attempts make a car a lemon in Wisconsin?
Four or more repair attempts for the same warranty defect that still is not fixed qualifies, as does a vehicle that has been out of service a cumulative 30 or more days for warranty defects. The defect must first be reported within one year of delivery or within the warranty term, whichever ends first.
Do I get to choose between a refund and a replacement?
Yes. Under Wis. Stat. 218.0171, the consumer chooses. You can demand a comparable new replacement vehicle or a full refund of the purchase price plus collateral costs, minus a statutory mileage-based allowance for use. The manufacturer must comply within 30 days of your written demand.
How is the 'reasonable allowance for use' deducted from my refund?
Wisconsin uses a formula: the purchase price multiplied by the miles you drove before first reporting the defect, divided by 100,000. Reporting the problem early and at low mileage keeps this deduction small.
What happens if the manufacturer ignores my Wisconsin Lemon Law demand?
If the manufacturer fails to provide your refund or replacement within 30 days, you can sue in circuit court and may recover double your pecuniary loss plus court costs and reasonable attorney fees. The fee-shifting often lets consumers hire a lemon-law attorney at little or no upfront cost.
Does Wisconsin's Lemon Law cover used cars and motorcycles?
It can. The protection follows the manufacturer's original written warranty, so a used vehicle still within that warranty and the one-year delivery window may qualify. Motorcycles are covered, but the dwelling portion of a motor home, mopeds, and semitrailers are excluded.
This article is general legal information, not legal advice, and may not reflect the most current law or the law in your jurisdiction. Laws vary by state and change over time. For advice about your specific situation, consult a licensed attorney.
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