Approval Details

Valid E.O.


This Executive Order approved the specified parts on on March 22, 1993.
As of Friday, March 31st, 2023 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModification
7.3L1988-1992 Ford vehicles powered by a 7.3L Navistar International heavy duty diesel-engine.Replacement exhaust system and crankcase depression regulator

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-171-6
  • Executive Order 171-6 / D171-6
  • ARB # D-171-6
  • Executive Order No: D-171-6
  • C.A.R.B. No. D-171-6
  • Resolution D-171-6
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-171-6 PDF

D-171-6 Document:

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