Honda 2001 Passport, Owner'S Manual, Page: 255 / 317

Exhaust Gas Recirculation (EGR)
System
The Exhaust Gas Recirculation
(EGR) system takes some of the
exhaust gas and routes it back into
the intake manifold. Adding
exhaust gas to the air/fuel mixture
reduces the amount of NOx
produced when the fuel is burned.
Three-Way Catalytic Converter
The Three-Way Catalytic
Converter is in the exhaust
system. Through chemical
reactions, it converts HC, CO, and
NOx in the engine's exhaust to
carbon dioxide (CO
2
), dinitrogen
(N
2
), and water vapor.
Replacement Parts
The emissions control systems are
designed and certified to work
together in reducing emissions to
levels that comply with the Clean
Air Act. To make sure the
emissions remain low, you should
use only new Genuine Honda
replacement parts or their
equivalent for repairs. Using
lower quality parts may increase
the emissions from your vehicle.
The emissions control systems are
covered by warranties separate
from the rest of your vehicle.
Read your warranty manual for
more information.
The tires on your vehicle meet all
U.S. Federal Safety
Requirements. All tires are also
graded for treadwear, traction, and
temperature performance
according to Department of
Transportation (DOT) standards.
The following explains these
gradings.
Uniform Tire Quality
Grading
Quality grades can be found
where applicable on the tire
sidewall between the tread
shoulder and the maximum
section width. For example:
Treadwear 200
Traction AA
Temperature A
A ll passenger car tires must
conform to Federal Safety
Requirements in addition to these
grades.
Owner Assistance
DOT Tire
Quality Grading