New Mexico Used Car Lemon Law: The 15-Day, 500-Mile Warranty

New Mexico does have a used car lemon rule, but it is short. Under NMSA 57-16A-3.1, a used motor vehicle dealer cannot disclaim the implied warranty of merchantability for 15 days or 500 miles after delivery, whichever comes first, which means the car has to work for ordinary highway driving during that window. You must give the dealer notice within 30 days of the problem and a reasonable chance to repair it, and you can be charged up to $25 for each of the first two repairs. There is no 60-day or mileage-tiered warranty like some states have, and private sales are not covered at all.

I read the section on Saturday, October 17, 2026, in FindLaw's copy of the New Mexico Statutes, which says it is current as of January 1, 2024, and checked it against the Attorney General's Used Car Buyers Guide. The state's official compilation lives on NMOneSource, which did not render text for my tools, so if a 2025 or 2026 session changed the section, I could not see it. Treat this as general information, not legal advice.

What the 15-day/500-mile rule actually says

The rule borrows the Uniform Commercial Code's implied warranty, section 55-2-314, and stops dealers from waiving it early. Subsection C says the warranty is met if the car "functions substantially free of a defect that significantly limits" its use for ordinary transportation on a public highway. That is a lower bar than "nothing is wrong." A dead A/C compressor in August is miserable, but whether it "significantly limits" transportation is arguable; a transmission that will not hold gear clearly does. The clock also pauses: days the car is broken and miles driven to get it fixed do not count against your 15 days or 500 miles.

The AG's guide states it more bluntly: "There are no 'as-is' used car sales at licensed dealers." It also says you have to take the car back to the selling dealer before you try any repairs yourself. That second line matters. If you tow it to your cousin's shop first, expect an argument.

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Who counts as a dealer

Section 57-16A-2 defines a used motor vehicle dealer as a person or business that has sold or offered four or more used vehicles in the previous twelve months. Banks, insurance companies, an employer selling to an employee, and a lessor selling to its lessee are excluded. The buyer has to be a consumer using the car mainly for personal, family or household purposes, and the vehicle must be a passenger car, pickup, van or motorcycle under 10,000 pounds gross weight, sold and registered in New Mexico. Read literally, someone flipping four cars a year off a front yard fits that definition too.

For a true private sale, the AG says state law does not regulate it, and any problem becomes a private civil matter. The only rule in 3.1 for non-dealers is that the seller must hold a title in their own name before selling. Our New Mexico private sale title transfer guide covers that paperwork.

Waivers, the contract notice and refunds

A dealer can only get you to waive the warranty for a particular, disclosed defect. Subsection I requires the dealer to fully disclose the problem and you to sign and date a boldface statement on the first page of the sale agreement, in the language the sale was pitched in, listing that problem. The dealer has to prove it followed those steps. Every dealer contract also has to carry a boldface notice that the car will be fit for ordinary use for 15 days or 500 miles and that you may pay up to $25 per repair for the first two; a contract without it, or a dealer who tries to disclaim the warranty, makes the deal voidable at your option.

The remedy is capped. The seller's maximum liability is the purchase price, refunded to you or your lender when you return the car, unless the seller knew or should have known of a defect and kept quiet. Damage after the sale from off-road use, racing, towing, abuse, neglect or skipped maintenance and fluids is excluded. Any lawsuit runs through the UCC's Article 2 remedies. The AG's office has also told buyers, in advice covered by KRQE, to file with the MVD's Automotive Industry Complaint form and the New Mexico Automotive Dealers Association's program before going to the Department of Justice.

How this compares, and the new car law

Honestly, New Mexico is near the thin end. New Jersey and Connecticut both write in longer dealer warranties tied to mileage, as our New Jersey used car lemon law and Connecticut posts explain. New Mexico's new car law, the Motor Vehicle Quality Assurance Act in the same article, only helps a later owner if the problem is reported within the factory warranty or one year of original delivery, whichever ends first. Four failed repairs of the same problem or 30 business days in the shop presumes a lemon, the maker must get written notice and a chance to cure, and suits are due within 18 months of original delivery. Federally, the Buyers Guide rules sit in 16 CFR Part 455.

Check the history before day one

Fifteen days is not long, so do the homework before you sign. Have a mechanic look at the car, run the VIN through NMVTIS, and read our New Mexico salvage and rebuilt title rules post if the title looks off. If a report shows a manufacturer repurchase, see our lemon law buyback title brand explainer. The AG's guide still quotes about $35 for a CARFAX and $24.99 for an AutoCheck, numbers that look dated next to what we saw this month. CarVins is a licensed CARFAX and AutoCheck reseller with no tie to CARFAX, AutoCheck, Experian or the state; in mid October 2026 we charged about $5.50 per report for guests, $4.50 for members and near $6.75 for both, versus roughly $39.99 to $44.99 direct. Confirm at checkout, and never accept a seller's PDF in place of a report you pulled.