Approval Details

Valid E.O.


This Executive Order approved the specified parts on on April 18, 2005.
As of Tuesday, June 25th, 2024 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 2.4 g/bhp-hr or higher. This exemption excludes all engines equipped with an aftertreatment emission control system such as a catalytic converter or a diesel particulate filter. This exemption also excludes engines equipped with an exhaust gas recirculation system with the following exceptions: 2003 model-year Cummins 5.9 liter ISB engines and 2003 model-year Cummins 10.8 liter ISM engines.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 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 with a maximum sulfur content of 50 ppmw.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-393-14
  • Executive Order 393-14 / D393-14
  • ARB # D-393-14
  • Executive Order No: D-393-14
  • C.A.R.B. No. D-393-14
  • Resolution D-393-14
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-393-14 PDF

D-393-14 Document:

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