Massachusetts Lemon Law for Used Cars: Refunds, Warranties, and Remedies

The Massachusetts lemon law for used cars, set out in General Laws Chapter 90, Section 7N¼, requires every dealer who sells a used vehicle to provide a written warranty on parts and labor for any defect that impairs the car’s safety or use. If the dealer can’t fix a covered defect after three repair attempts, or if the car has been out of service for more than ten business days for the same problem, you can return it for a full refund. A separate statute lets you void the sale outright if the car fails state inspection within seven days. Together these rules give used car buyers in Massachusetts some of the strongest protections in the country.¹

Which Used Cars Are Covered

The law covers any used motor vehicle sold by a dealer to a consumer if the odometer reads fewer than 125,000 miles at the time of sale and the car is used primarily for personal or family purposes. Auto homes, vehicles built primarily for off-road use, and vehicles used mainly for business are excluded.¹

“Dealer” is defined more broadly than most people expect. Anyone who has sold more than three used vehicles in the previous twelve months qualifies, even without a formal dealership license. That threshold matters because the warranty rules that follow apply only to dealers. Someone who sold you a car as a true private party sits outside this statute.

The Warranty the Dealer Must Give You

Every qualifying sale comes with an express written warranty covering the full cost of parts and labor for defects that impair the vehicle’s safety or use. Length depends on the odometer reading at the time of sale:¹

Under 40,000 miles: 90 days or 3,750 miles, whichever comes first.
40,000 to 79,999 miles: 60 days or 2,500 miles, whichever comes first.
80,000 to 124,999 miles: 30 days or 1,250 miles, whichever comes first.

A dealer can require you to pay up to $100 total toward covered repairs during the warranty period, and nothing more. If the dealer never gave you written notice of these warranty rights at the time of sale, the warranty period doesn’t start running until that notice is provided.²

When You Can Demand a Refund

You do not have to keep bringing the car back forever. If the dealer fails to repair the same defect in three attempts, or if the vehicle has been out of service for a cumulative total of more than ten business days for the same problem, you can return the car and demand a full refund of the repurchase price.¹

The statute gives you a refund. It does not force the dealer to hand over a replacement car. If you want a different vehicle from that dealer, that becomes a matter of negotiation once the refund obligation is triggered.

What the Refund Includes

“Repurchase price” is defined broadly. It covers the total of all payments made in connection with the purchase, including finance charges, registration fees, credit insurance payments, service contracts, and the value of any trade-in. The dealer must also reimburse incidental costs: towing up to thirty miles for repairs or return, and alternative transportation up to $15 per day in rental charges, starting after the second day of each breakdown.¹

The dealer is allowed to deduct a reasonable allowance for your use of the car (accounting for the miles you drove before the defect surfaced) and to subtract any prior cash settlement you already accepted. Even with those deductions, the math usually favors the buyer, especially on cars that fail early in the warranty period.

The Seven-Day Inspection Rule

A separate statute, General Laws Chapter 90, Section 7N, gives you an additional way out. If the car fails state safety inspection within seven days of sale, and the repairs needed to pass exceed ten percent of the purchase price, you can void the sale entirely. This applies even where the dealer tried to disclaim warranties.³

To use this right, notify the seller within fourteen days of the sale and return the vehicle along with a written statement from the inspection station explaining the failure and estimating repair costs. The seller can offer to make the repairs at their own expense within a reasonable time, but only if you agree in writing. If you don’t agree, you are entitled to a full refund of the purchase price.³

A single car can trigger both the inspection remedy and the warranty remedy, or just one.

Dealers Cannot Sell “As-Is”

Section 7N¼ mandates the express written warranty for every qualifying dealer sale, and there is no opt-out.¹ Massachusetts also blocks a common workaround: under Chapter 106, Section 2-316A, any attempt by a seller of consumer goods to exclude or modify the implied warranty of merchantability or fitness for a particular purpose is unenforceable, and this provision cannot be waived by agreement.⁴ If a Massachusetts dealer tells you a car is being sold “as-is,” that statement has no legal effect.

How to Enforce Your Rights

Notify the dealer of the defect in writing during the warranty period, and give them the chance to repair it. Save every repair order, receipt, and written communication. If the dealer cannot fix the problem within three attempts or ten business days out of service, return the vehicle in writing and demand a refund of the repurchase price.

State Arbitration

If the dealer refuses, Massachusetts runs a Used Vehicle Arbitration Program through the Office of Consumer Affairs and Business Regulation. You apply for arbitration, and a neutral arbitrator hears both sides.⁵

The program is all or nothing. The arbitrator either orders a full refund (minus a use allowance and any prior settlement) or awards nothing. There is no partial refund option. The decision binds the dealer, who must issue the refund or file an appeal within twenty-one days. Late payment or a frivolous appeal can lead a judge to award double damages. If the arbitrator rules against you, the decision is not binding on you, and you can still go to court.⁵

Filing a Complaint With the Attorney General

The Attorney General’s Office handles consumer complaints against dealers and can investigate patterns of violations. Filing a complaint does not replace arbitration, but it adds pressure on dealers who refuse to cooperate.⁶

Chapter 93A: Treble Damages and Attorney’s Fees

A dealer who refuses to honor warranty obligations, conceals known defects, or otherwise engages in deceptive practices can also be liable under Chapter 93A, the state’s unfair and deceptive trade practices law. Before you file a 93A lawsuit, you must send the dealer a written demand letter at least thirty days ahead of filing, describing the unfair practice and the harm you suffered. If the dealer makes a reasonable settlement offer within those thirty days and you reject it, your court recovery may be capped at the offer amount.⁷ Skipping the demand letter is one of the most common and costly mistakes.

If you win, you recover actual damages or $25, whichever is greater. When the court finds the dealer’s conduct was willful or knowing, damages jump to between two and three times your actual damages. The court also awards reasonable attorney’s fees and litigation costs on top.⁷

Private Sales Are Different

Section 7N¼ applies only to dealer sales. If you bought from a private individual who sold three or fewer vehicles in the past year, you get no mandatory written warranty, no arbitration program, and no state-run enforcement mechanism.¹

You still have the implied warranty of merchantability under Chapter 106, Section 2-316A, because that provision applies broadly to sellers of consumer goods and cannot be waived.⁴ In practice, enforcing that against a private seller usually means going to court. The best protection in a private sale is a pre-purchase inspection by an independent mechanic.

Documentation Wins Cases

From the first symptom, keep a written log of every problem, every repair visit, and every conversation with the dealer. Get a written repair order each time you drop the car off, and a written summary of the work when you pick it up. Save towing receipts and rental invoices, which are recoverable as part of the repurchase price.

Put your communications with the dealer in writing. Certified letters and email create a record you can use in arbitration or court. When you demand a refund, do it in writing and keep proof of delivery. If the dispute eventually becomes a 93A lawsuit, that written demand letter is a legal prerequisite, and the thirty-day clock starts running from the day the dealer receives it.

1
General Court of Massachusetts. Massachusetts General Laws Chapter 90 Section 7N1/4 – Express Warranty by Dealer of Used Motor Vehicle
2
General Court of Massachusetts. Massachusetts General Laws Chapter 90 Section 7N1/4 – Express Warranty by Dealer of Used Motor Vehicle
3
General Court of Massachusetts. Massachusetts General Laws Chapter 90 Section 7N – Voiding Contracts of Sale
4
General Court of Massachusetts. Massachusetts General Laws Chapter 106 Section 2-316A – Limitation on Exclusion or Modification of Warranties
5
Mass.gov. Apply for Lemon Law Arbitration
6
Mass.gov. Lemon Laws
7
General Court of Massachusetts. Massachusetts General Laws Chapter 93A Section 9 – Civil Actions and Remedies