See also:

Three-way catalyst
The three-way catalyst is an emission control device installed in the exhaust system. Exhaust gases in the three-way catalyst are burned at high temperatures to help reduce pollutants. - Th ...

Safety
Standard features include dual-stage front airbags, seat-mounted side-impact airbags and side curtain-type airbags. The seat belts have pretensioners and load limiters. Active head restraints for ...

Going & Stopping
Base Altimas have a 2.5-liter four-cylinder engine that makes 175 horsepower (170 hp in states that have adopted California's emissions rules). A 270-hp, 3.5-liter V-6 is optional. A six-speed man ...