O2 sensor

My check engine light came on today and my code reader said the code was PO141 which is a O2 sensor heater circuit malfunction (Bank 1 Sensor 2). Which side is bank one and is sensor two the sensor before or after the converter. Also should I replace all of the sensor or just the bad one.

I believe it's after the converter. Not 100% sure, but sounds right....Mike

Bank 1 is passenger (curb) side, #2 is the second one back, the one AFTER the front converter.

I would replace both of them if you have dual exhaust at that point. On my chebbie, my computer would only throw a code if the sensor wiring was disconnected, but that is a chevy. All the fords i own are either old enough that they don;t have sensors or they are diesel, boy nothing beats the PSD.