Approval Details

Valid E.O.


This Executive Order approved the specified parts on on February 18, 1997.
As of Thursday, July 25th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

1990 and older Detroit Diesel Corporation (DDC) heavy duty two stroke diesel engines for urban bus applications

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-420
  • Executive Order 420 / D420
  • ARB # D-420
  • Executive Order No: D-420
  • C.A.R.B. No. D-420
  • Resolution D-420
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-420 PDF

D-420 Document:

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