truck was in with engine light on p207f with force limit power in dash . replaced nox sensor update pcm , truck returned aprox. 200km later truck returned with same code further diag lead to replacing particular filter assembly cat. sent truck off with custumer and returned once again with same code and issue followed ppt . rd ka w . anyone have this issue just recurring p207f. poss. egr issue throwing nox sensor out of range , didn't seem to find any issue with air intake leaks .