why 2 oxygen sensors?

[THE NEW GUY]

Does the presence of two oxygen sensors means that the ECU have two different injection calculators? one for each side of the engine? or the ECU take the reading of one of them to do an overall correction? Does somebody knows which one of the oxygen sensors is the one that the ECU reads?

[92snowmachine]

if your car is obd1 then it has two sensors and the ecu controls the fuel trim for each bank individually, it can add or subtract fuel to either bank without affecting the other. if your car is obd2 then it also has o2 to monitor that the cat is working.

[THE NEW GUY]

my car is OBD I. Can you please tell me why is that the acceleration feeling disapear so fast when I keep on pushing the gas pedal?
How to make it more responsive... It has a 3.3 liters!
I´ve change all the vacuum hoses and air intake gaskets, I´ve repair the EGR valve, Replace the two first cats for plain tubes... but nothing, CEL ligth goes on from time to time without any change in the performance. Is it something I can do to improve the sporty feeling?