The bank 1, sensor 3, O2 sensor would be the O2 sensor post cat.
usually bank 1 is the bank with # 1 cylinder in it and sensor # 1 is the front o2 sensor(usually in the manifold). You will need a O2 sensor socket or a 22mm wrench or deep socket.
Bank 1 is the bank of cylinders that contain the number 1 cylinder. O2 sensor 1 is the first O2 sensor in the exhaust system between the engine and the catalytic converter.
You did not specify which O2 sensor it is. Is it sensor 1 bank 1, sensor 2 bank 2, sensor 2 bank 1, or sensor 1 bank 2. There are four O2 sensors on a mazda 626
Bank 1 is the bank of cylinders that contain cylinder 1. The O2 Sensor 1 is the O2 sensor located in the exhaust system between the cylinder head and the catalytic converter, also known as the "upstream" O2 sensor.
P0137 = O2 sensor circuit low volts (bank 1 sensor 2). Could be a faulty B1 S2 O2 sensor.
Assuming this is a V-6, bank 1 sensor 1 would be the first O2 sensor in the exhaust on the drivers side of the engine.
P0130 = O2 sensor circuit malfunction (bank 1 sensor 1) P0150 = O2 sensor circuit malfunction (bank 2 sensor 1)
it is the rear sensor bank 1 (the one after the converter)
It depends on your vehicle. Bank 1 is the O2 sensor on the same side of the car as cylinder number one (or the odd cylinders). Sensor 1 indicates the O2 sensor before the Catalytic Converter.
O2 sensor heater circuit malfunction (bank 1 sensor 1). You probably have a burned out Bank 1 Sensor 1 O2 sensor. Also check the wiring at the sensor for damage.
All O2 sensors are threaded into the exhaust system at various points. Bank 1 Sensor 1 would be the first O2 sensor located in the exhaust system after the bank of cylinders that contain the #1 cylinder.