Approval Details

Valid E.O.


This Executive Order approved the specified parts on on October 22, 2002.
As of Friday, June 21st, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

1991-2002 model-year 4-stroke heavy-duty diesel and diesel/natural gas bi-fuel engines with horsepower ratings less than 600. This exemption excludes any engines equipped with an oxidation catalyst, diesel particulate filter, or an exhaust gas recirculation system.The system includes a urea injection system, an SCR catalyst, and control sensors.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-547
  • Executive Order 547 / D547
  • ARB # D-547
  • Executive Order No: D-547
  • C.A.R.B. No. D-547
  • Resolution D-547
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-547 PDF

D-547 Document:

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