Approval Details

Valid E.O.


This Executive Order approved the specified parts on on April 19, 1974.
As of Sunday, June 4th, 2023 this Executive Order has not been overturned or superceeded.

Approved Parts

1974 and older vehicles with engines > 140 CID

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-28
  • Executive Order 28 / D28
  • ARB # D-28
  • Executive Order No: D-28
  • C.A.R.B. No. D-28
  • Resolution D-28
For Free CARB Executive Order Status verification, email an image of the device Executive Order label as well as the Year/Make/Model and Test Group # of the vehicle to [email protected]

Download: Executive Order D-28 PDF

D-28 Document:

Current View

| Previous E.O. D-27 | Next E.O. D-28-1 | Next E.O. D-29