### Question
How is the term onboard emissions diagnostic device defined?


### Answer
The term **onboard emissions diagnostic device** is defined in *42 U.S.C. § 7541* as the following:

> any device installed for the purpose of storing or processing emissions related diagnostic information, but not including any parts or other systems which it monitors except specified major emissions control components

#### Citation:
  - *42 U.S.C. § 7541*
  - Heading: **CHAPTER 83-ENERGY EXTENSION SERVICE > SUBCHAPTER II-EMISSION STANDARDS FOR MOVING SOURCES > Part A-Motor Vehicle Emission and Fuel Standards**

