I'm getting codes p0031 and p1148 on my 2007 Altima 3.5 SE.
From what I've read, p1148 is caused by p0031. P0031 relates to the voltage on the heater circuit of the 02 sensor on Bank 1, Sensor 1.
I know that most likely I just need to replace the O2 sensor, but I'm unsure (after researching for hours) which one I should be replacing.
Does anyone know if this would be the Front or Rear? And if it is downstream or upstream?