Approval Details

Valid E.O.


This Executive Order approved the specified parts on on March 11, 1976.
As of Saturday, September 30th, 2023 this Executive Order has not been overturned or superceeded.

Approved Parts

1975 and older model year vehicles except as follows: 1) Those vehicles originally equipped with breakerless ignition systems or dual point ignition systems where one of the points is used to retard timing for emission control. 2) Those 1966 through 1970 vehicles equipped with NOx retrofit devices with a 4 degree retard in basic ignition timing.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-54-4
  • Executive Order 54-4 / D54-4
  • ARB # D-54-4
  • Executive Order No: D-54-4
  • C.A.R.B. No. D-54-4
  • Resolution D-54-4
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-54-4 PDF

D-54-4 Document:

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