Canadian Hummer Club Forums

Can anyone out there help me out by letting me know which is "Bank One Sensor Two" in reference to O2 Sensors.  Is Bank One the driver side exhaust and Bank 2 the Passenger side exhaust.  Is Sensor one before the Catylic converter, closer to the motor and Sensor two past the converter on the way to the muffler?



Should I be replacing all O2 sensors at the same time or just the one giving me the code.



Thanks,



Rob

I am quite sure its driver side rear sensor.

Mr. Steve is correct...