Exhaust Emissions and Aftertreatment Diesel
Particulate Filters (DPFs)
General
USA
Emissions Control Compliance: The Federal Clean Air Act, Section 203 (a) (3), states the
following concerning the removal of air pollution control devices or modification of a
certified engine to a non-certified configuration:
“The following acts and the causing thereof are prohibited:
(3) For any person to remove or render inoperative any device or element of design installed
on or in a motor vehicle or motor vehicle engine in compliance with regulations under this
part prior to its sale and delivery to the ultimate purchaser, or for any manufacturer or
dealer knowingly to remove or render inoperative any such design after sale and delivery to
the ultimate purchaser.”
Specifically, please note that no person may make such changes prior to the sale and delivery
of the vehicle to the ultimate purchaser, and, in addition, no manufacturer or dealer may
make take such action after sale and delivery of the vehicle to the ultimate purchaser. The
law provides a penalty of up to $10,000 for each violation.
Modifications, such as reprogramming of the fuel system so the engine will exceed the
certified horsepower or torque, or removing the mufflers are examples of illegal changes.
Changes should not be made to a certified engine that would result in an engine that does
not match the configuration of an engine model that is currently certified to meet Federal
Standards.
Mexico
The same conditions that apply in the USA apply to Mexico. Refer to the Mexican Federal
Law for Emission Control which adheres to EPA regulations. No changes should be made
that render any or all of the emissions control devices inoperative.
If the owner/operator wishes to make changes to the emission control devices, check with
the state authority before changes are made.
Canada
The same conditions that apply in the USA apply to Canada, with one exception. After the
vehicle is sold to a retail customer, that is, the end user, the jurisdiction controlling the
emission control devices becomes the province in which the vehicle is licensed. No changes
should be made that render any or all of the devices inoperative.
Should the owner/operator wish to make any changes to the emission control devices, check
with the provincial authority before making any such changes.
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