I have a 1997 Nissan Maxima GXE. Within the past six months the check engine light came on and I replaced front O2 sensor 1. Everything was fine until last week when the light came back on. I have since replaced front O2 sensor 2 (per diagnostic code) and reset the computer. However, the check engine light has come back on again with "P0136 O2 sensor circuit malfunctioning bank 1 sensor 2". Any ideas why the light has come back on when the sensor is brand new?
P0136 - Bank1 Sensor2 is the rear O2 sensor located behind the catalytic converter. This is the O2 sensor you need to replace. See below:
This is a Paysite
The 1997 Maxima has two front sensors and one rear sensor. The people at Autozone told me that bank 1 is the front and bank 2 is the rear. Is this incorrect?
Yes, Autozone was incorrect. What I provide you is out of Nissan service manual.
Here is a diagram showing locations of Bank1 Sensor1 and Bank2 Sensor1:
For every vehicle this is how to tell which O2 sensor is being referred to.
Bank1 is side where cylinder #1 is located
Bank2 is side where cylinder #2 is located
Sensor1 is before the catalytic converter(upstream)
Sensor2 is after the catalytic converter(downstream)