Massachusetts used vehicle warranty law
Massachusetts used cars have their own statute — the Used Vehicle Warranty Law, M.G.L. c. 90, § 7N¼. It works differently from the new-vehicle lemon law: the selling dealer must give you a warranty by law, and if the dealer cannot fix the same defect, the dealer must take the car back. This page is the used law on its own. For new and leased vehicles, see the Massachusetts filing guide. Last reviewed: October 2026.
⚡ Start here — three free tools
Massachusetts lemon law quiz (3 minutes): compare your facts to the tests — pick "Used" when it asks.
Deadline calculator: the dates and windows on this page, from your delivery date.
Repair log: record each dealer visit as it happens — the warranty clock runs from the sale.
Who and what is covered
A "dealer" is a seller who has sold more than 3 used motor vehicles in the preceding 12 months. The law does not apply to a used vehicle sold by a dealer for less than $700. Excluded: auto homes, vehicles built primarily for off-road use, motorcycles (note the difference — the new-vehicle law covers them), and vehicles used primarily for business purposes. Private-party sales are not covered by this law — they have their own disclosure rule, covered below.
The mandatory warranty and its tiers
No used vehicle may be sold by a dealer in Massachusetts unless it comes with an express written warranty covering the full cost of parts and labor to repair any defect that impairs the vehicle’s safety or use. Your share is capped: you can be required to pay no more than $100 total toward covered repairs during the warranty period. Defects that affect only appearance do not count as impairing safety or use. The warranty length depends on mileage at the time of sale:
| Mileage at sale | Warranty |
|---|---|
| Under 40,000 miles | 90 days or 3,750 miles, whichever comes first |
| 40,000 to under 80,000 miles | 60 days or 2,500 miles, whichever comes first |
| 80,000 to under 125,000 miles | 30 days or 1,250 miles, whichever comes first |
| 125,000 miles or more | No warranty under these tiers |
If the vehicle’s true mileage isn’t known, the warranty is set by age instead: 3 years old or less gets the first tier, more than 3 but less than 6 years the second, 6 years or more the third. The warranty periods are tolled (paused) while the vehicle is out of service for a warranty repair attempt. And if a defect shows up right at the end, you must present the vehicle to the dealer for repair no later than 5 business days after the warranty period expires and tell the dealer about the defect.
The refund trigger
If the dealer fails to repair the same defect within 3 attempts, or the vehicle is out of service for more than 10 cumulative business days after you returned it to the dealer for repair of the same defect, the dealer must accept return of the vehicle and refund the repurchase price. The dealer also has the option, at any time during the warranty period after you have complained of a defect, to repurchase the vehicle and refund the repurchase price (less the use allowance below) even over your objection.
What the refund includes
The refund is the full repurchase price, less a reasonable allowance for use of 15 cents per mile the vehicle was driven between its sale and the dealer’s repurchase. "Repurchase price" starts from the purchase price — the total of all payments made for the vehicle, including finance charges, registration fees, insurance payments, service contracts, and the value of a trade-in — less any accepted cash award and any refunds or rebates, plus incidental damages not already reimbursed, such as reasonable towing costs. The buyback calculator shows the 15-cents-per-mile math for a Massachusetts used purchase.
Used-car arbitration and deadlines
All dealers must submit to state-certified used car arbitration if you request it, asserting your right to a repurchase, within 6 months from the date of original delivery of the used vehicle to you. The finding is issued within 45 days of the request being received. If the vehicle is found to meet the standards and the dealer hasn’t refunded you, the dealer has 21 days to deliver the refund or appeal in district or superior court — with a bond equal to the award plus $500 for anticipated attorneys’ fees. An action under the used vehicle law must be commenced within 2 years of the date of original delivery of the used vehicle. A prevailing consumer is likewise awarded reasonable attorneys’ fees and costs, and a dealer’s failure to comply with § 7N¼ is an unfair or deceptive act under chapter 93A.
Private-party sales
Private-party sales are not covered by the Used Vehicle Warranty Law and are not eligible for state arbitration. A private seller must still clearly disclose all known defects that impair the vehicle’s safety or substantially impair its use before the sale is completed. If the seller fails to disclose, the buyer may rescind the sale within 30 days and recover the money paid, less a reasonable amount for use. That is a different, narrower remedy — if it is your situation, an attorney can assess it.
Common questions
Does Massachusetts have a lemon law for used cars?
Yes — the Used Vehicle Warranty Law, M.G.L. c. 90, § 7N¼. Dealer-sold used vehicles must come with a written warranty (90, 60 or 30 days depending on mileage at sale), and a dealer that cannot repair the same defect within 3 attempts, or keeps the vehicle more than 10 cumulative business days, must accept its return and refund the repurchase price less 15 cents per mile of use.
How long is the Massachusetts used-car warranty?
By mileage at sale: 90 days / 3,750 miles under 40,000 miles; 60 days / 2,500 miles from 40,000 to under 80,000; 30 days / 1,250 miles from 80,000 to under 125,000; no warranty under the tiers at 125,000 or more. If mileage is unknown, age sets the tier instead.
How much can the dealer charge me for warranty repairs?
Your total share toward covered repairs is capped at $100 during the warranty period; the warranty covers the full cost of parts and labor for defects impairing safety or use beyond that cap.
What is the deadline to request used-car arbitration in Massachusetts?
Within 6 months from the date the used vehicle was originally delivered to you. The finding is issued within 45 days of the request; a court action under the law must be commenced within 2 years of delivery.
Official sources: the Commonwealth’s Guide to Used Vehicle Warranty Law (Mass.gov — Office of Consumer Affairs and Business Regulation), which states the warranty terms, repair-attempt and return rules, and arbitration route summarized here, and the law itself, M.G.L. c. 90, § 7N¼. More primary sources are collected in the Massachusetts filing guide, whose used-vehicle section this page expands.