What do I need to do for sure with a PO141 code that keeps coming back after a few days. Read where is stated Bank 1, sensor 2. Which oxy sensor is that one? Do I just replace or is there some checking that I can do. Thanks!

HO2S , sensor 2

check the fuse for the sensor and wiring b4 replcaement
fuse under the hood cell 10 , ERLS FUSE 10A

P0141 = O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

The heating element is broken in this sensor. Very common and annoying.:banghead: The sensor will still work, but you'll have a constant CEL until you replace the sensor. I forget which side of the Y-pipe is bank #1 on the 3.1L, but sensor 2 means it's downstream of the catalytic converter. It really sux because the "sensor 2" sensors do nothing more than monitor catalytic converter function. They are an go/no-go gauge, that's it.

Joel