Vehicle must be 2 model years older than current year when you take the credit, so 2022 model year and older.
Used Vehicle credit only applies to sale price below 25K.
If you are trading in a vehicle, they can drop your trade in price and the sale price, but I'm sure there's a limit to how far...
I have the same vehicle (2017). As this this the PHEV version, there is no traditional starter or alternator.
The engine is started by the high voltage traction pack and the 12V battery is topped up by a DC to DC converter.
I'm not sure if this would work, but I think it would.