Approval Details

Valid E.O.


This Executive Order approved the specified parts on on October 23, 2003.
As of Sunday, June 16th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModification
DPM1111442003 MY Caterpillar 3126 and 2004 MY Caterpillar C7 heavy-duty diesel engines, originally equipped with diesel oxidation catalystsThe stock diesel oxidation catalysts are replaced with the DPF Mufflers. The exemption is limited to 280 school buses owned by First Student, Inc. and operated in the Los Angeles Unified School District. The exemption is only valid provided that the engines meet the following operating conditions: (1) engine exhaust temperature is greater than or equal to 225 degrees Celsius for 40-50 percent of the duty cycle and (2) the engine is fueled with diesel having a maximum sulfur content of 50 ppmw.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-249-5
  • Executive Order 249-5 / D249-5
  • ARB # D-249-5
  • Executive Order No: D-249-5
  • C.A.R.B. No. D-249-5
  • Resolution D-249-5
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-249-5 PDF

D-249-5 Document:

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