1999 Nissan Altima 4cyl. 2.5l codes check-engine-light

Question

My code reader says. O2 sensor heater circuit bank 1 sensor2

Where is this sensor. The front of the engine block or on the exhaust system?
Thanks,

Answer 1

Hi there,

This code is for the rear O2 sensor. This is under the car after the catalytic converter. In the exhaust pipe.