ok, making sure becuase an injector from a 98 is different. They should have Light Green tops, and the Ford number on the injectors should be F87E-BA.
Either way let's move on, These are both possibly o2 codes, but seeing them together at the same time makes me suspicious it's something else. If I see these codes individually, I would jump to replace the o2 sensors.
Here are the possible causes of the codes.
* Base engine
mechanical fault (e.g., compression, valve timing)
* Check air cleaner element and air cleaner housing for blockage
* EVAP vapor recovery system has failed (canister full of fuel)
* Fuel pressure too high, contaminated or leaking fuel injectors
* HO2S has failed (it may be contaminated with fuel, silicone or water)
Check the fuel pressure. Also, clean the mass air flow sensor because a faulty reading can cause the long term fuel trims to run rich.