### Question
How is the "specified major emission control component" defined?


### Answer
The term **specified major emission control component** is defined in *42 U.S.C. § 7541* as follows -

> only a catalytic converter, an electronic emissions control unit, and an onboard emissions diagnostic device, except that the Administrator may designate any other pollution control device or component as a specified major emission control component if—


(A) the device or component was not in general use on vehicles and engines manufactured prior to the model year 1990

#### Citation:
  - *42 U.S.C. § 7541*
  - Heading: **SUBCHAPTER I-PROGRAMS AND ACTIVITIES > Subchapter Referred to in Other Sections > Part Referred to in Other Sections**

