Approval Details

Valid E.O.


This Executive Order approved the specified parts on on May 23, 2001.
As of Tuesday, April 23rd, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

1991-2001 model-year Caterpillar 3208, 3116, 3126, 3306, 3406, C10, C12, C15, and C16 heavy-duty diesel enginesThis exemption applies to 1991-2001 model-year 4-stroke engines originally certified to meet a particulate matter emission standard of 0.10 g/bhp-hr or lower.This exemption is valid provided the engines meet the following operating conditions: (1) engine exhaust temperature is greater than or equal to 275 degrees Celsius for 40-50 percent of the duty cycle; (2) NOx to PM ratio is at least 8; and (3) engine is operated using diesel fuel with a maximum sulfur content of 50 parts per million by weight.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-393-3
  • Executive Order 393-3 / D393-3
  • ARB # D-393-3
  • Executive Order No: D-393-3
  • C.A.R.B. No. D-393-3
  • Resolution D-393-3
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-393-3 PDF

D-393-3 Document:

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