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Do you have a fuel pressure gauge? Where did he get fuel pump?
Did they test his fuel pump or his oil pump? Do you know what brand pump he got at O'Reillys?
The bank 1 sensor 2 high fault could be his problem. I would start by replacing the fuel pressure regulator on the fuel rail.
It is possible the regulator may fix his problem.
That is a precision brand. I would still start with a regulator. They are inexpensive and a regular failure part. pretty easy to change with a pair of snap ring pliers.
If the regulator does not fix I would have fuel pressure tested again. If it is under 55PSI I would replace it with an ACDelco pump.