Approval Details

Valid E.O.


This Executive Order approved the specified parts on on May 14, 1996.
As of Monday, April 15th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModification
Model # AD10, AD20, AD30, & AD401995 and older diesel enginesInjects cerium oxide into the intake air system

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-403
  • Executive Order 403 / D403
  • ARB # D-403
  • Executive Order No: D-403
  • C.A.R.B. No. D-403
  • Resolution D-403
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-403 PDF

D-403 Document:

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