Does anyone have a really good understanding or recent first hand knowledge of what the current laws are and what is required to be able to register a vehicle in Maricopa County that has a different engine than it came with? I've read that the last few years, Arizona has really started cracking down on registering vehicles with engine swaps. More specifically, I'm looking for info on swapping an engine in a "newer" vehicle (post OBDII). Everything I have done has been old stuff to old stuff. 
From what I have read, the engine needs to be from a same year or newer vehicle, all emissions equipment from the donor vehicle intact and then some conflicting info on the ECU. I've seen both info on that when they plug in, the ECU needs to read the VIN from the current vehicle and conflicting info that it needs to read the VIN from the donor vehicle. Information seems to be all over the place out there. Any guidance would be appreciated. Thanks.
From what I have read, the engine needs to be from a same year or newer vehicle, all emissions equipment from the donor vehicle intact and then some conflicting info on the ECU. I've seen both info on that when they plug in, the ECU needs to read the VIN from the current vehicle and conflicting info that it needs to read the VIN from the donor vehicle. Information seems to be all over the place out there. Any guidance would be appreciated. Thanks.
