Approval Details

Valid E.O.


This Executive Order approved the specified parts on on September 9, 2005.
As of Thursday, July 25th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

1987 through 2004 model-year 4-stroke diesel engines used in heavy-duty on-road vehicles. This exemption excludes all engines equipped with an exhaust gas recirculation system and/or an aftertreatment emission control system such as a catalytic converter or a diesel particulate filter.This exemption is only valid provided the engines meet the following operating conditions: (1) the engine exhaust temperature is greater than or equal to 240 degrees Celsius for 40 percent of the typical duty cycle, (2) the NOx to PM ratio is at least 8, and (3) the engine is operated using diesel fuel with a maximum sulfur content of 500 ppmw.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-393-16
  • Executive Order 393-16 / D393-16
  • ARB # D-393-16
  • Executive Order No: D-393-16
  • C.A.R.B. No. D-393-16
  • Resolution D-393-16
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-393-16 PDF

D-393-16 Document:

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