I did a leak back test on injectors and no1 & no3 were obviously faulty, sent them off for repair, refitted them went to code them noticed code held was completely different to the codes on the injectors in fact all 4 were different, so inputted the new codes into ecu, started car really rough on tick over, black smoke and lop on road test.
re inputted original codes back in still the same.
can any one shed any light on what might be wrong?
regards
Martyn

Aidan is correct there are slightly different injectors available for these. First port of call, check the EJDR number & confirm you have like for like injectors back from the repairer.

What was the initial fault that made you carry out the leak back test to start with ?

Have you imputed the codes to the correct cylinders, different tools do this in different orders ie cylinder order or firing order