Approval Details

Valid E.O.


This Executive Order approved the specified parts on on June 29, 1998.
As of Saturday, February 24th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

1998 and older vehicles powered by a diesel engine and utilizing liquid coolantThe device is a fuel heater that uses engine coolant to heat incoming diesel fuel. Diesel fuel temperature is regulated using a thermostat and solenoid valve

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-456
  • Executive Order 456 / D456
  • ARB # D-456
  • Executive Order No: D-456
  • C.A.R.B. No. D-456
  • Resolution D-456
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-456 PDF

D-456 Document:

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