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P0622 has to do with the alternator field coil. If possible, have your alternator inspected/tested. Check circuit for wiring issues- broken/exposed wires, etc.
The alternator is fielded/grounded by the PCM. You need wiring schematics. Check continuity between the alternator and PCM for the field wire. If it is good, the PCM has lost the ground for the alternator(if not, fix or run a new wire). You can fix it two ways. First replace the PCM and have it programmed to the car. This cost money and it will turn the battery light off. Second, is to cut the field wire close( give yourself room to work) to the alternator, add wire to it and ground it to the engine(making sure the engine has a ground strap to the body). This may or may not turn the battery light off. But it will charge the battery.
My guess is you may have wired something up wrong, or installed a faulty part. Either that or forgot to plug something back in while you were putting it back together. In other words replacing a battery and alternator shouldn't cause the oxygen sensor to go bad. So my suggestion is to check all plugs and wires to make absolutely certain everything is put back together correctly before you sink more money into fixing what's not broken. Haynes repair manuals list all the engine fault codes so for everyone else reading this, if you get codes check your manual or head to the library to look it up in theirs.
code p0622 refers to alternator ,field control-circuit malfunction causes--wiring ---alternator---battery---ECM. I would have the battery load tested first to check for loose for terminals and failing cells. Then check that the plug in the back of the alternator is tight
P0622 is "Generator field 'F' control circuit malfunction"- your alternator has a circuit malfunction in the voltage regulator function. You need to have the charging system checked. It may be a wiring problem in the circuit to the alternator. A shop needs to test it out. P0601 is "Internal control module memory check sum error"- I have no idea what that means, but is probably set because the charging system has a malfunction, and the result may be memory loss in the control module when the alternator acts up. Have the 0622 fixed, erase the codes, and see if the 0601 returns. That is what I would do, anyway.
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