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Injectors covered under diesel engine to 100k.
Injectors on any PSD have never been cab off, so your buddy got hosed, if it was just an injector replacement.
You MAY have introduced air into the fuel system, but typically it wouldn't run poorly enough long enough to trip any codes.
Monitor it and see if it comes back. I'd suggest putting the truck back to stock before you bring it in, unless you have a dealer that's modification friendly. Also, if it DOES happen to set a code again, please don't clear it, it makes it very difficult to have a diagnostic path otherwise.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.