Massachusetts Used Car Warranty Law: Repairs, Refunds, and Arbitration

The Massachusetts used car warranty law requires licensed dealers to back qualifying used vehicles with an automatic warranty, and it lets you demand a full refund if the dealer cannot fix a serious defect within set limits. The rules sit in M.G.L. c. 90, § 7N¼. They set warranty length by the odometer reading at delivery, cap what you can be charged for warranty repairs at $100 total, and give you access to state-run arbitration if the dealer refuses to buy the car back. A separate seven-day inspection right protects every buyer, dealer or private-party.

Which Cars and Sellers Are Covered

The dealer warranty applies to used cars, vans, and trucks bought for personal or family use. The vehicle must cost at least $700 and have fewer than 125,000 miles on the odometer when you take delivery.¹ Motorcycles and commercial vehicles do not qualify.²

The $700 figure covers more than the sticker price. It includes any trade-in or over-allowance, add-ons bought from or through the dealer, preparation costs, and any other charges paid to the dealer.³ If everything you paid the seller totals less than $700, the warranty rules do not apply.

“Dealer” is defined broadly. Anyone who has sold more than three vehicles in the previous 12 months counts as a dealer under this statute, even without a dealer license.² Someone flipping cars on the side may owe you the same warranty a licensed lot would.

How Long the Warranty Lasts

Warranty length depends on the odometer reading at delivery: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.

When the true mileage is unknown, age replaces mileage. Three years old or less gets the 90-day warranty, more than three but under six years gets 60 days, and six years or older gets 30 days. Age is the purchase year minus the model year.¹

The warranty is automatic. A dealer cannot ask you to waive it, and if the dealer skips the paperwork or gives you an incomplete disclosure, your warranty period does not start running until you actually get the proper disclosure.²

What the Warranty Covers

Coverage applies to defects that impair the vehicle’s safety or substantially impair its use. That reaches the engine, transmission, drive axle, steering, brakes, fuel system, and cooling components.⁴ Every warranty repair the dealer performs carries its own 30-day warranty starting the day you pick the car up.

Cosmetic problems, items still covered by the manufacturer’s original warranty, damage from negligence or abuse, damage from post-sale accidents, repairs attempted by outside shops, and problems caused by substantial modifications you made are all outside coverage.²

Getting a Warranty Repair

When a covered defect appears, contact the selling dealer by phone or in writing. The dealer must accept the car for repair within three business days.² Across all warranty repairs, the dealer cannot charge you more than $100 in total.

If the dealer refuses to take the car in, that refusal works in your favor. The vehicle is treated as out of service starting three days after the dealer turned you away, which pushes you closer to the refund threshold.

Save every repair order. Each one should show the drop-off date, the return date, the mileage when you left it, and what work was performed. Those records are the evidence you will need if the problem does not go away.

When You Can Demand a Refund

You are entitled to a full refund if a covered defect persists or recurs during the warranty period and either of these thresholds is met:⁴

The dealer has attempted to fix the same defect at least three times and the problem remains.
The car has been out of service at the dealer’s shop for a cumulative total of more than ten business days for any combination of defects. Any part of a business day counts as a full day.

Only one trigger has to be met. Eleven business days out of service qualifies you for a refund even if the dealer has only attempted one repair. Once you hit the threshold, the dealer must accept the car back and refund the repurchase price.

How the Refund Is Calculated

The refund starts with the full contract price, including any trade-in value and document or administrative fees. On top of that, the dealer must reimburse:²

Finance charges and registration fees
The proportional cost of collision and comprehensive insurance
Non-refundable credit life and credit accident insurance payments
Non-refundable payments toward extended warranties or service contracts
Towing costs up to 30 miles
Up to $15 per day for alternate transportation, starting on the third day the car was out of service
Anything you paid toward the $100 repair deductible

The dealer then subtracts a use allowance of 15 cents per mile driven between delivery and the refund date. Miles driven to and from the dealer for repairs do not count against you.¹ Any rebates built into the original contract are also subtracted. You have at least five business days after receiving the dealer’s offer to decide whether to accept it.

Arbitration if the Dealer Refuses

If the dealer will not buy the car back, apply for state-certified arbitration through the Office of Consumer Affairs and Business Regulation. Your application has to be received within six months of the delivery date.⁵ Miss that window and the program is closed to you.

There is no application fee. Once a hearing is scheduled, you owe the arbitrator $300, and if you win, that $300 is added into your award, so a successful case costs you nothing.⁵ A decision generally comes within 45 days of the arbitrator accepting the case.

The arbitrator can order a full refund or deny the claim, and nothing in between. Partial refunds, additional repair orders, and warranty extensions are not available. A winning consumer gets paid or appealed within 21 days; late payment or a frivolous appeal can lead a judge to award double damages.⁵ Arbitration is for dealer purchases only. Private-party sales are not eligible.

The Seven-Day Inspection Right

Every used car buyer in Massachusetts, dealer or private-party, has the right to get the vehicle inspected at a licensed station within seven days of the sale. If the car fails and the estimated repair cost is more than 10 percent of the purchase price, you can return the car for a full refund. This applies even to vehicles above the 125,000-mile warranty ceiling.

To use it, you need a written statement from the inspection station explaining why the car failed and a mechanic’s estimate showing repairs would top the 10 percent threshold. The failure cannot be from your own negligent or abusive driving, or from an accident after the sale. Send the seller written notice that you are returning the car along with copies of the failure statement and the estimate. Certified mail gives you the clearest proof that notice was delivered.

Buying From a Private Seller

Private-party sales fall outside the mileage-based warranty tiers and outside the arbitration program. There is still a narrower protection. If the car has a defect that impairs safety or substantially impairs its use, and you can prove the seller knew about it and did not tell you, you can cancel the sale within 30 days. The seller must refund your money minus 15 cents per mile you drove.⁶

The burden is on you to show the seller actually knew about the defect before the sale, which is often the hardest part. This protection applies regardless of mileage, so even a car with 150,000 miles is covered if the seller concealed a known defect.

Federal Backup

The federal Magnuson-Moss Warranty Act covers any written warranty on a consumer product, including a used vehicle. If a dealer or manufacturer gives you a written warranty and then does not honor it, you can sue. Consumers who prevail can recover attorney fees and court costs on top of damages, which makes smaller claims worth pursuing.⁷

Federal odometer rules add another layer. Under 49 CFR Part 580, sellers must disclose the odometer reading at transfer. Vehicles 20 model years old or older are exempt.⁸ If a seller rolls back or misstates the mileage on a newer car, federal remedies are available in addition to whatever state law provides.

1
General Court of Massachusetts. Massachusetts General Laws Chapter 90 Section 7N1/4
2
Mass.gov. Guide to Used Vehicle Warranty Law
3
Falmouth Massachusetts. A Dealers Guide To The Massachusetts Used Vehicle Warranty Law
4
Cornell Law Institute. 201 CMR 11.22 – Notices to Consumers (Used Vehicles)
5
Mass.gov. Apply for Lemon Law Arbitration
6
Mass.gov. Private Party Car Sales
7
Office of the Law Revision Counsel. 15 USC 2310 – Remedies in Consumer Disputes
8
eCFR. Odometer Disclosure Requirements