The P0031 code problem with the oxygen sensor heater circuit for the bank 1 sensor 1.
So, it looks like the front oxygen sensor is bad/defective here is the location of the sensor and instructions so you can check it out. Also make sure the cooling fan is plugged in which it might have been undone in the first repair. Check out the images (below). Please let us know what happens.
Images (Click to make bigger)
SPONSORED LINKS
Wednesday, May 10th, 2023 AT 1:27 PM