How long does federal law require the emissions warranty to cover emissions-related parts?

Federal law mandates that emissions warranties must cover emissions-related parts for a duration of two years or 24,000 miles, whichever comes first. This requirement is part of the Clean Air Act, aimed at ensuring that manufacturers provide customers with a guarantee that their vehicle's emissions control systems will function properly during that period. The warranty includes repairs or replacement of parts that affect emissions performance, thereby promoting adherence to emission standards and protecting air quality. This requirement reflects the importance placed on mitigating environmental impact by ensuring vehicles maintain proper emissions levels for a designated period after sale.