Codes indicate; Both sides of the Engine are running lean. Your fuel pressure reading indicates; Fuel pressure is way too low should be about 48 pounds Min to Run correctly!
Check voltages for 13.8-14.5 Volts at the battery while running and about 12 volts+ at the Fuel Pump Fuse, Check for fuel line leaks starting from fuel tank (Most likely won't find any), Next should Replace the fuel filter in this case regardless of what you find (Check for leaks before and after replacement), Next Replace the fuel regulator (Check for Fuel and Vacuum leaks) and finally Replace fuel pump.
However, other opinion are as follows;
What causes the P2197 code?
O2 sensors create a rapidly oscillating voltage signal based on the amount of oxygen in the exhaust stream. The voltage signal ranges from 0.1 volts to 0.9 volts. This oscillating voltage takes place in a matter of milliseconds and should never maintain a constant voltage. This code states that the voltage is not oscillating and is being held high indicating a lean condition in bank 2.
Possible causes Faulty Front Heated Oxygen Sensor Bank 1 Front Heated Oxygen Sensor Bank 1 harness is open or shorted Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection Inappropriate fuel pressure Faulty fuel injectors Intake air leaks may be faulty Vacuums leaks
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It'll work ...Enjoy!