P0031 TOYOTA -

Question

2004 tacoma 3.4 where is the o2 heater located

Answer 1

Hi there,

The code is for the heater circuit on the O2 sensor, sensor1 bank 1. This is the first O2 sensor on the passenger side of the truck. Typically the heater wire inside the sensor burns up and the sensor needs to be replaced to resolve the issue.