Approval Details

Valid E.O.


This Executive Order approved the specified parts on on August 7, 2003.
As of Saturday, April 20th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

1994-2002 Caterpillar 3116, 3126, 3176, 3306, 3406, C10, C12, C15, and C16 heavy-duty diesel enginesThis exemption does not apply to any engines originally equipped with an aftertreatment emission control system such as a catalytic converter.This exemption is only valid when the engine exhaust temperature is between 280 and 325 degrees Celsius for at least 25 percent of the typical duty cycle. The engines can be operated on standard California diesel, ultra-low sulfur diesel, or PuriNOx fuel based on standard California diesel or ULSD.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-420-5
  • Executive Order 420-5 / D420-5
  • ARB # D-420-5
  • Executive Order No: D-420-5
  • C.A.R.B. No. D-420-5
  • Resolution D-420-5
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-420-5 PDF

D-420-5 Document:

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