Why would a 1999 Ford Ranger show error code P0153 O2 sensor slow response Bank 2 Sensor 1 and where is the sensor located?

I got the same code. Broke down and bought the manual. From what I undestand, .. Bank one is the engine side with cylinder #1 (plug wire #1) and bank two will be the other side. Sensor one is between the engine and the cataltic converter. #2 is after the converter. I just got the truck from son#2 so I'm not really sure if cylinder 1 is drivers or passengers side yet. s'pose I'll have to go look. Oh yeah, DON'T get a Chiltons manual... really poorly done. Should have gone with the Haynes. Oh well.