bank 2 is the driver's side of the engine and sensor 1 is close to the engine either in the outlet of the exhaust manifold or in the exhaust pipe (helpfull)
Downstream ... This is after the Catalyst Converter.
Passenger side, exhaust system. Start at the exhaust manifold and go backward toward the converter. You will find the O2 sensor.
You can find a 1996 Nissan Pathfinder knock sensor picture in most auto repair manuals. Most Nissan dealerships repair centers will provide you with a picture of the sensor.
it means a oxygen sensor on bank 1 is not working. you need to find bank 1 and figure out if it is sensor 1 or 2. sensor 1 is in front of the cat. converter. sensor 2 is behind the converter
The coolant temp sensor wire comes from the firewall area. An easy way to make the temp sensor work if you can not find it is to connect the sensor directly to the battery. The sensor uses wireless technology to send its data. It might take an hour or more of driving for the sensor to reset before it starts sending data to the computer. .
On the exhaust pipe It is before the catalytic converter on the same side as cylinder #1.
P0125 is about coolent temp. sensor the problem is not the coolent sensor. When you have lazy Oxygen sensor you get this code. It is sensor 1 but you need to find out which bank, the only way you can find this out by snapon scanner.
The rear cylinders are 1-3-5 so that is bank 1. Front cylinders are 2-4-6 so that is bank 2. Follow the exhaust pipe from bank 2 and you will find the O2 sensor.
On a Ford F-150 , bank 1 is the passenger side of the engine and sensor 2 is in the exhaust pipe after the catalytic converter ( downstream )
Find cylinder one, usually on the driver side. That is Bank one side, then go to the second O2 sensor, which will be the one after the cat converter.
open your owner manual and you will find the answer.
The engine size is needed to answer your question.