For those that don't already know it , if you have a Hybrid HOV plate, it dies when your car dies/sells/changes owners. No exceptions.
Previously, one could transfer their plate to another vehicle. That is no longer the case. You MUST transfer it by purchasing a qualifying vehicle, basically a plug-in hybrid. Pure EV qualifies for alternative fuel plate and can get unlimited HOV lane access.
There is a lot of motivation to keep an HOV tagged Prius running, and there are lots of maintenance options outside the dealership! If I were lucky enough to have one (late to the game in that regard), I'd swap engines to keep it! :)
AZ MVD page concerning Energy Efficient Plate Program: