Would the P0031 Code on a nissan sentra 2002 cause the engine to overheat

Question

Firstly the P0031 code came up the heater started blowing cold air when stationary and now the car keeps over heating, could Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 cause this problem!

Also how do you check the sensor is working or has the correct voltage it needs to operate normally, is there a way of testing this with a voltmeter

Answer 1

HI there,

This will not cause the engine to overheat. In most cases when you get this code it's due to the sensor itself. I would check the wiring harness for the sensor as it's possible the sensor wiring is damaged. This sensor basically is a 4 wire sensor. A main voltage, 12 volts, a ground, then a signal wire for the sensor and a signal wire for the sensor heater. So, check for 12 volts, continuity to ground, a fluctuating voltage from .5 to 1. volt when running and finally a consistent voltage around .5 milli volts for the sensor heater.