I am having a Po2cf and Po2d7 code come up. Truck runs fine but the codes are annoying. I did a turbo replace including the EGR and Pump at 140K truck at 144K anyone have the same code and reconciled it?? The reference is to injectors "searching"

 

Might be two injectors going bad?

P02CF – Cylinder 2 Fuel Injector Offset Learning at Max Limit
P02D7 – Cylinder 6 Fuel Injector Offset Learning at Max Limit

Zero Fuel Calibration:
Zero Fuel Calibration (ZFC) is an algorithm used to compensate for deviations in individual injector performance
from nominal. In an overrun/decel fuel shut-off condition, fuel rail pressure is set to 300 bar and small injections are
made from a single injector. The observed acceleration in crankshaft speed is detected and a regression line
generated to predict the fueling required to achieve the expected acceleration. If the calculated fueling required to
generate the expected acceleration in crankshaft speed falls outside the allowable control limits for the system, an
addition routine is called to very precisely learn the adjustment to injector energizing time required to achieve
expected acceleration. This information is then used to adjust all pilot injections on that injector to ensure correct
fuel delivery. If the absolute energizing time observed for the test injection to yield the expected acceleration
exceeds minimum or maximum limits, a code is set.

 

I had the cylinder 5 learning max which required replacement of the injector. All eight injectors can be tested, my #5 was out of spec per a graph of each. Mine was drive-able but in reduced power. The DTC would flag each drive but the CEL would only occasionally illuminate.