Question

"Nissan Altima 2011/Check Engine light"

Answer 1

HI there,

This code is for the heater circuit on the bank 1 O2 sensor, sensor #1. This is the first O2 sensor in the exhaust at the top of the converter. You can see it from under the hood. In most cases it's a problem with the sensor itself and once the sensor is replaced the code can be cleared and things go back to normal.