At Average U.S. Mileage the 80,000-Mile Emissions Warranty Period Expires Before the Eighth Year

Two federal emission warranties ride on every new light-duty vehicle sold in the United States, and neither one is the bumper-to-bumper warranty in the glovebox. Both come from the Clean Air Act at 42 U.S.C. 7541 and from the rules the Environmental Protection Agency writes under it at 40 CFR part 85, subpart V. Each of them carries two periods: a general one of 24 months or 24,000 miles, and one of 8 years or 80,000 miles that reaches only a short list of parts. At the average annual mileage the Federal Highway Administration reports for light duty vehicles, those two periods expire on opposite limits, and have done so for five straight years.

Two periods, one statute, one start date

The statute fixes the lengths in 42 U.S.C. 7541(i)(1) and (i)(2), and the regulation states them twice, because there are two warranties. The emission performance warranty is set by 40 CFR 85.2103(c)(1): “For light-duty vehicles, light-duty trucks, and medium-duty passenger vehicles, the warranty period for the emission performance warranty is 24 months or 24,000 miles, except that the warranty period is 8 years or 80,000 miles for any nonconformity resulting from a failed specified major emission control component identified in paragraph (d) of this section.” The emission defect warranty in 40 CFR 85.2103(d)(1) runs the same two lengths, written there as “two years or 24,000 miles” and “eight years or 80,000 miles” for the listed components.

What separates the two is the trigger. The defect warranty answers to defects in materials and workmanship; the performance warranty answers to a test result with a consequence attached. Under 40 CFR 85.2103(c) the manufacturer must remedy the nonconformity at no cost “if such nonconformity results or will result in the vehicle owner having to bear any penalty or other sanction (including the denial of the right to use the vehicle) under local, State, or Federal law.”

The eight-year list in 40 CFR 85.2103(d)(1) is specific: catalytic converters and SCR catalysts and related components; particulate filters and particulate traps; components related to exhaust gas recirculation with compression-ignition engines; the emission control module; and batteries serving as a Renewable Energy Storage System for electric and plug-in hybrid vehicles. The statutory list is shorter and comes with a designation clause: “As used in this paragraph, the term "specified major emission control component" means only a catalytic converter, an electronic emissions control unit, and an onboard emissions diagnostic device, except that the Administrator may designate any other pollution control device or component as a specified major emission control component if- (A) the device or component was not in general use on vehicles and engines manufactured prior to the model year 1990; and (B) the Administrator determines that the retail cost (exclusive of installation costs) of such device or component exceeds $200 (in 1989 dollars), adjusted for inflation or deflation as calculated by the Administrator at the time of such determination.”

Two warranty periods, one start date 40 CFR 85.2103(b), (c)(1) and (d)(1) - light-duty vehicles, light-duty trucks and medium-duty passenger vehicles Start: delivered to the ultimate purchaser - or, on a demonstrator or company car, first placed in service 24 months or 24,000 miles - general coverage 8 years or 80,000 miles - specified major emission control components 2 years 4 6 8 years Each period ends on the specified age or mileage, whichever comes first. Medium-duty vehicles run on a different general period: 5 years or 50,000 miles.

The clock can start before the sale

Both periods run from the same event, and that event is not necessarily the sale. 40 CFR 85.2103(b) sets it out in three sentences: “The warranty periods under this section apply based on the vehicle's age in years and on the vehicle's odometer reading. The warranty period expires based on the specified age or mileage, whichever comes first. The warranty period for a particular vehicle begins on the date the vehicle is delivered to its ultimate purchaser or, if the vehicle is first placed in service as a "demonstrator" or "company" car prior to delivery, on the date it is first placed in service.”

For a car that spent time on a dealer lot as a demonstrator, or in a manufacturer's company fleet, the eight-year term is already running when the buyer signs, and the date is fixed by the in-service record rather than the purchase contract. A demonstrator delivered nine months after it went into service has nine months less of that term than the purchase date suggests.

The coverage follows the vehicle, not the first buyer

Neither warranty is limited to the original owner. 42 U.S.C. 7541(a)(1) directs the manufacturer of each new motor vehicle and new motor vehicle engine to “warrant to the ultimate purchaser and each subsequent purchaser” that the vehicle conforms at the time of sale with the applicable regulations and is free from defects in materials and workmanship which cause it to fail to conform for its useful life.

A second or third owner is a subsequent purchaser, and subpart V sets out no transfer form and no registration step. The clock does not reset: it runs from the original delivery or in-service date. A used vehicle bought at five years old with 60,000 miles carries what is left of the eight-year, 80,000-mile term and none of the 24-month term.

Which limit expires first at ordinary mileage

Because each period ends “based on the specified age or mileage, whichever comes first”, each pair is really a driving-rate threshold, and neither EPA nor FHWA publishes it. This article's calculation: 24,000 miles over 24 months is 1,000 miles a month, or 12,000 miles a year; 80,000 miles over 96 months is 833.33 miles a month, or 10,000 miles a year. Below 10,000 miles a year both periods end on time; above 12,000 both end on the odometer. Between those two rates they split, and the gap is only 2,000 miles a year.

That gap is where ordinary American driving sits. In Highway Statistics, Table VM-1, “Annual Vehicle Distance Traveled in Miles and Related Data”, the Federal Highway Administration puts average miles traveled per vehicle for all light duty vehicles at 11,520 in 2019, 10,143 in 2020, 10,775 in 2021, 10,952 in 2022 and 11,106 in 2023.

Average miles traveled per vehicle, all light duty vehicles FHWA Highway Statistics, Table VM-1 - shown against the two rates that decide which limit expires first 12,000 11,000 10,000 12,000 miles a year: the 24-month line 10,000 miles a year: the 8-year line 11,52010,14310,77510,95211,106 20192020202120222023 Every one of these five years sits between the two rates. In that band the 24-month period ends on time and the 8-year period ends on mileage - this article’s calculation from 40 CFR 85.2103. Source: FHWA, Highway Statistics, Table VM-1, average miles traveled per vehicle, all light duty vehicles.

At the 2023 figure of 11,106 miles a year the two periods come apart measurably. This article's calculation, from that average and the periods in 40 CFR 85.2103: 80,000 miles arrive at 86.4 months, roughly 9.6 months before the eight-year date, and a vehicle driven at that rate would read about 88,848 miles on its eighth anniversary, 8,848 miles past the cap. The short period runs the other way, because 24,000 miles arrive at 25.9 months. The 24-month date ends it first, at about 22,212 miles, leaving 1,788 miles of the stated 24,000 unused.

The shortfall tracks the rate: at the 2019 average of 11,520, 80,000 miles arrive at 83.3 months, 12.7 months early; at the 2020 average of 10,143, at 94.6 months, only 1.4 months early. The 24-month side is steadier, since 24,000 miles arrive later than 24 months at each of the five averages.

The claim starts with a test the manufacturer does not run

A performance warranty claim begins with a failed inspection, and 40 CFR 85.2106(a) is explicit about how little else is required: “A claim under the emission performance warranty may be raised immediately upon the failure of an EPA-approved emission test if, as a result of that failure, an owner is required to take action of any kind in order to avoid imposition of a penalty or sanction. An owner need not suffer the loss of the right to use a vehicle, be fined, incur repair expenses, or actually bear any penalty or sanction to satisfy the requirement of Sec. 85.2103(a)(3).”

From that presentation a deadline runs. Under 40 CFR 85.2106(d) the manufacturer's claim procedures must “Provide for a final decision by the vehicle manufacturer within a reasonable time, not to exceed 30 days from the time at which the vehicle is initially presented for repair or within the time period during which an owner is required by local, State or federal law to have the vehicle repaired without incurring further penalties or sanctions (whichever is shorter), unless a delay (i) Is requested by the vehicle owner, or (ii) Is caused by an event not attributable to the vehicle manufacturer or the warranty repair facility; and” the second requirement is that a facility unable to honor a claim forward it to someone authorized to decide for the manufacturer, unless the owner waives that in writing. If the manufacturer is unable to repair the vehicle within that period, for reasons not attributable to the owner and not beyond the control of the manufacturer or an authorized repair facility, 40 CFR 85.2107(d) moves the choice of shop to the owner, who “shall be entitled to have the warranty remedy performed, at the expense of the manufacturer, by any repair facility of the owner's choosing.”

How a performance warranty claim is triggered and timed 40 CFR 85.2106(a), (b) and (d), and 40 CFR 85.2107(d) 1. The vehicle fails an EPA-approved emission test not a test the manufacturer runs 2. That failure starts a process ending in a penalty or sanction if unrepaired 3. Vehicle presented to a facility the manufacturer authorizes for that model 4. Final decision within 30 days of presentation - or the shorter repair deadline in local, State or federal law unless the delay is requested by the owner, or caused by an event not attributable to the maker or the facility 5. Not repaired within that period, for reasons not attributable to the owner and not beyond the manufacturer’s or the facility’s control? The remedy may then be performed at the manufacturer’s expense by any repair facility of the owner’s choosing.

What the record has to show

Two record sets carry the weight here, and both are built before the failure. The first is the scope record: once the short period ends the obligation narrows, and 40 CFR 85.2107(a) says how far. The manufacturer bears all costs “except that after the first 24 months or 24,000 miles (whichever first occurs) the manufacturer shall be responsible only for: (1) The adjustment, repair or replacement of any of the specified major emission control components listed in 42 U.S.C. 7541(i)(2) or components which have been designated by the administrator to be specified major emission control components until the vehicle has been in operation for 8 years or 80,000 miles; and (2) All other components which must be adjusted, repaired or replaced to enable a component adjusted, repaired, or replaced under paragraph (a)(1) of this section to perform properly.” Item (2) is easy to miss: a part that is not on the list is still in scope when it has to be replaced to make a listed part work.

The second is the maintenance record. Under 40 CFR 85.2104(b) a manufacturer may demand evidence only for instructions it has an objective reason to believe were not performed and could have caused the vehicle to exceed the standards. Where that demand is made, 40 CFR 85.2104(c) gives three alternatives, not a checklist:

  1. “A maintenance log book which has been validated at the approximate time or mileage intervals specified for service by someone who regularly engages in the business of servicing automobiles for the relevant maintenance instruction(s); or”
  2. “A showing that the vehicle has been submitted for scheduled maintenance servicing at the approximate time or mileage intervals specified for service to someone who regularly engages in the business of servicing automobiles for the purpose of performing the relevant maintenance; or”
  3. “A statement by the vehicle owner that he or she performed the maintenance at the approximate time or mileage interval specified including a showing, (i) That the owner purchased and used proper parts, and (ii) Upon request by the vehicle manufacturer, that the owner is able to perform the maintenance properly.”

In documentary terms: dated repair orders or invoices carrying the odometer reading at each service, a validated log book if one is kept, parts receipts where the owner did the work, and the inspection failure report that starts the period in 40 CFR 85.2106(d).

Where this framework does not apply

  • Older vehicles and other classes. These sections are “applicable to all 1981 and later model year vehicles subject to standards under 40 CFR part 86, subpart S” (40 CFR 85.2101(a)).
  • Medium-duty vehicles run on different numbers. Under 40 CFR 85.2103(c)(2) and (d)(2) their general period is five years or 50,000 miles, while the 8-year, 80,000-mile term for the listed components is unchanged.
  • The long term does not spread to other parts. 42 U.S.C. 7541(i)(2) ends with two sentences that carry no subparagraph number. The first defines one of the listed components: “For purposes of this paragraph, the term "onboard emissions diagnostic device" means any device installed for the purpose of storing or processing emissions related diagnostic information, but not including any parts or other systems which it monitors except specified major emissions control components.” The second is the limit, and the sentence it points back to is that definition: “Nothing in this chapter shall be construed to provide that any part (other than a part referred to in the preceding sentence) shall be required to be warranted under this chapter for the period of 8 years or 80,000 miles referred to in this paragraph.”
  • The battery item is not yet universal. 40 CFR 85.2103(d)(1)(v) is “optional before model year 2027 for light-duty vehicles and light-duty trucks at or below 6,000 pounds GVWR”, and optional for heavier vehicles until they are certified to the Tier 4 standards named there, “not later than model year 2031.”
  • No inspection program, no performance claim. The trigger in 40 CFR 85.2106(a) is a failed EPA-approved emission test that sets a penalty or sanction procedure in motion. Where no such program applies, that trigger does not arise, though the defect warranty is unaffected.
  • State programs are separate. Some states set their own emission warranty terms by state law, and those terms are not the ones in subpart V.
  • An average is not an odometer. The FHWA figure is a fleet average; a driver at 6,000 or 20,000 miles a year falls in a different band.

Numbers to Re-check

  • 40 CFR 85.2103 is moving. It was issued in its present form in April 2024 and amended twice since. Its source note reads [89 FR 28152, Apr. 18, 2024, as amended at 89 FR 50234, June 13, 2024; 91 FR 7759, Feb. 18, 2026]. Read the current component list at ecfr.gov/current/title-40/section-85.2103
  • The FHWA average moves every year. Table VM-1 is republished with each edition of Highway Statistics at fhwa.dot.gov/policyinformation/statistics/2023/vm1.cfm. A newer edition adds a year and moves the average used here, and with it every month count derived from it.
  • One cross-reference is stale. As the sections read on 5 September 2026, 40 CFR 85.2106(a) points to Sec. 85.2103(a)(3), which the current 40 CFR 85.2103 does not contain.
  • Statutory text for the periods and the component definition: law.cornell.edu/uscode/text/42/7541, subsections (a)(1) and (i).

This article describes published federal statutes, regulations and public statistics as they stood on 5 September 2026. It is not legal advice and creates no professional relationship; anyone dealing with a specific vehicle or warranty dispute should consult a licensed attorney in their state.

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