1998 Explorer V8 Displaying code P1131

Two weeks ago my Explorer displayed the code that bank 1 oxygen sensor
was slow to respond (I forget the code #). I replaced the bank 1
sensor and disconnected the battery which reset the codes and forced
the vehicle to relearn. Vehicle ran without throwing any code until I
was entering a freeway at high acceleration. It now reads the codes
PO401 (EGR Isufficient flow detected) and P1131 Lack of HO2S11
Switch-Sensor indicates Lean. I read that the vehicle is in open loop
until the sensor reaches 600 degrees F and at WOT (wide open throttle).
Entering the freeway I did not have the pedal to the floor but was
trying to get up to 60mph from a stop. One note also is that I
replaced the EGR valve about 10,000 miles ago.

Any thoughts?

.

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