I'm trying to get one thing ironed-out on the Monte. The C-E-L is ON. Although, I have seen it OFF.

Today, it's ON. Went to AutoZone. Codes read.
(2) Codes. No others. No pending.

a) PO136 - O2 Sensor (Bank 1 Sensor 2)

b) PO137 - O2 Sensor (Bank 1 Sensor 2)

Although there are 2 Codes. I only need ONE Sensor, ... right?

Why is this Sensor 2 ... Where's Sensor 1?
Do I NEED the O2 Removal Socket?

What do I NEED to know before attempting to fix this myself?

Rick

 

Sensor 2 the 02 sensor after the cat. Sensor 1 is on the rear manifold, before the down pipe. All you should need to remove sensor 2 is a 7/8ths or 22 mm wrench.