Approval Details

Valid E.O.


This Executive Order approved the specified parts on on July 16, 2008.
As of Monday, April 15th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModificationRemarks
HH2 Hydrogen Generator1960-2008 model year passenger cars equipped with gasoline or diesel engines.Vinyl hose from device is inserted into opening of air intake housing.The HH2 device can not be installed on light-duty trucks and medium-duty vehicles under this Executive Order.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-643
  • Executive Order 643 / D643
  • ARB # D-643
  • Executive Order No: D-643
  • C.A.R.B. No. D-643
  • Resolution D-643
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-643 PDF

D-643 Document:

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