2004 XJ has a recently installed new Fuel Pump and Air Filter
I am getting the following codes at start-up; PO171, PO174, and PO193. These codes would seem to indicate that the engine is running learn. The engine, however, seems to running ok,
This is confusing. Can someone comment on what might be happening? Thanks,

 

PO -> P0 and then you can look up the codes in the free info

It's not running fine, as the codes show, just not so bad that you notice (yet).

There are so many threads about these codes that it's well worth reading some (as well as the workshop manual etc) as they give causes & fixes.