Approval Details

Valid E.O.


This Executive Order approved the specified parts on on September 25, 2001.
As of Sunday, February 25th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

2002 and older heavy-duty diesel vehicles

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-524
  • Executive Order 524 / D524
  • ARB # D-524
  • Executive Order No: D-524
  • C.A.R.B. No. D-524
  • Resolution D-524
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-524 PDF

D-524 Document:

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