One way to test the injector is to move the injector to another cylinder, clear codes, and then run the car to see if the codes follow the injector.
You might also be able to read the resistance on that injector and see if it's within spec.
_________________________
Kinda sorta, yeah, no?
'02 Black GTP - RIP 03/03/08 ||| '06 Black G35 MT6 - Stock ||| '73 Chevy half ton(resurrected)