Approval Details

Valid E.O.


This Executive Order approved the specified parts on on August 7, 2003.
As of Wednesday, May 22nd, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

1996-2003 model-year off-road compression-ignition engines of 20.0 liters or less displacementThis exemption is only valid provided the engines meet the following operating condition: the engine exhaust temperature is between 280 and 325 degrees Celsius for at least 25 percent of the typical duty cycle. The Purifilters can be installed on engines operated using standard California diesel, ultra-low sulfur diesel, or PuriNOx water emulsion fuel based on standard California diesel or ultra-low sulfur diesel.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-420U-6
  • Executive Order 420U-6 / D420U-6
  • ARB # D-420U-6
  • Executive Order No: D-420U-6
  • C.A.R.B. No. D-420U-6
  • Resolution D-420U-6
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-420U-6 PDF

D-420U-6 Document:

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