Final answer:
The government-mandated warranty for catalytic converters and engine control modules is the Federal Emissions Warranty. These components are critical for reducing vehicle emissions and complying with the Clean Air Act.
Step-by-step explanation:
The government-mandated warranty that specifically covers the catalytic converter(s) and engine control module is known as the Federal Emissions Warranty. Catalytic converters are essential for reducing photochemical emissions from vehicles. They operate by facilitating a reaction between carbon monoxide and hydrocarbons, using a metal catalyst like platinum to produce carbon dioxide and water. This also aids in converting nitrogen oxides into oxygen and nitrogen, effectively decreasing ozone formation. Due to their importance in controlling pollution, catalytic converters were made mandatory following the Clean Air Act amendments that President Nixon signed in 1970, which required significant reductions in vehicle emissions. Modern three-way catalytic converters also involve a platinum-rhodium catalyst, which further enhances the reduction of nitric oxide and oxidation of carbon compounds.