DIY: Replacing air/fuel sensor

[81corolla]

Here is a Do-It-Yourself (DIY) thread on changing the air/fuel sensor. You usually have to change it if the check engine light (CEL) is on and the car is throwing codes P0171, P1130, P1150, etc.

I don't want to get too much into whether you need to replace it or not. There are other threads that do that.

My car's CEL went on. I stopped by local AutoZone or Advance Auto and had them read the code. It was P1130 - bank 1 sensor 1. That's the a/f sensor on the back three cylinders exhaust manifold (rear). This DIY will cover replacing the back sensor.

If you need to replace the front sensor, it's similar just in a different spot. :-)