Can we reset "adaptation, mixture"?

[kevinkay]

Trying to figure out my Service Engine soon P1191 (Oxygen sensor too rich before cat. bank 2). Car runs fine. replaced tank breather valve (was getting an additional error on that originally) Cleaned up MAF, idle control valve, DISA seal is good, gas cap is tight. DMTL motor is working, cant find any air or vacuum leaks. Ruled out injector leaks as I switched them from bank 1 to bank 2 and still rich error ONLY in bank 2. Inspected and cleaned spark plugs.

Checked the adaptation mixture values and see they are different between bank 1 and bank 2. Do they constantly adjust or can we reset them?
Is it ever the case that we clear the "service eng. soon" too quickly and it returns because the car has not adjusted to the new or cleaned parts?

Thanks