P0131 code, replacing O2 sensor
Hello, recently my 2009 Sentra started throwing a couple of codes (P0131 and P0131-D6), oxygen sensor circuit low voltage bank 1, sensor 1. I had a code for the MAF months ago and cleaned it, then cleared the codes and it was OK for a couple of months. Then I got the P0131 code...cleared the codes and it went away for about two or three weeks and reappeared. I did some searching online and went to an online parts store to buy the sensor that would fix the code.
Now my question is...which sensor am I actually replacing? For whatever reason I can find almost no instructions online or on YouTube. I found one reference to the sensor being "easily accessible" but if I'm reading diagrams right, this sensor is on the back of the engine right by the exhaust manifold. Is that correct..? How should I be getting to it to replace the sensor? It seems like an easy swap if I can actually get to it. Thank you for any help you can offer.
Last edited by Tenmaru; 02-02-2019 at 08:43 PM.