I changed my o2 sensor today (the downstream one) and i went and got my CEL code cleared and the light came back on in five seconds. Im confused because its a brand new o2 sensor. The code is P0141 (i know it like the back of my hand now). It says that bank 1 sensor 2 is malfunctioning. All research points to a faulty o2 sensor but its brand new so why am I still getting the code even after it has cleared? Anyone have clue?