Approval Details

Valid E.O.


This Executive Order approved the specified parts on on April 18, 2005.
As of Monday, May 29th, 2023 this Executive Order has not been overturned or superceeded.

Approved Parts

1991-2004 model-year 4-stroke heavy-duty diesel engines originally certified to meet a particulate matter emission standard of 0.10 g/bhp-hr or lower. This exemption includes engines originally certified to meet a non-methane hydrocarbons plus oxides of nitrogen emission standard of 2.5 g/bhp-hr or higher, including those engines equipped with an exhaust gas recirculation system. This exemption excludes all engines equipped with 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 200 degrees Celsius for at least 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 50 ppmw.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-393-15
  • Executive Order 393-15 / D393-15
  • ARB # D-393-15
  • Executive Order No: D-393-15
  • C.A.R.B. No. D-393-15
  • Resolution D-393-15
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-393-15 PDF

D-393-15 Document:

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