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You need a scanner to see the function of each of the sensors and findout which is the one you need to change. nissan sentra has 2 upstream sensors and 2 downstream sensors. some scaners identify the sensors with a letter A OR B
check fuel pump, fuel pump fuse, distributor,and ignition coil please. then you will need to check crank position sensor.(to do this you need to find factory service manual)
it is wher the engine meets the transmission..on the flywheel...and the oxygen sensors bank 1 is the one before the catalyst....and bank 2 is the one after the catalyst....
Go to dealership they will give a diagram to locate every single one. I replace them on my daughter car. I believe there were three sensors. I exactly know what you are talking about. I had a hard time locating the back one right above the drive shaft on driver side.
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