Probably need new O2 sensors?

[donjetman]

Please show pics of clamps clamping? Would be appreciated.

Pics are in the following thresd:
https://www.tahoeyukonforum.com/thr...-cold-berryman-b12.120184/page-2#post-1469315

 

[Fless]

Downstream is the after cat sensors?

Yes. Upstream is pre-cat and reports to the PCM so it can adjust fuel trims.

 

[EddieC]

I chased what was reported as O2 sensor issue and I finally found a break in one wire inside the insulation adjacent to the sensor.
It made for intermittent and odd error codes; too lean then too rich and so on.
I didn't find it before replacing the sensor and a number of other things; Just know it is possible.

 

[dkad260]

Use only GM OE sensors, even Denso branded sensors are calculated differently then the Denso sensors in the ACDelco wrapper. The tips are different too. It does make a difference if you are after maximum performance and efficiency.

Downstream sensors - 12609457 or 213-4229 (same item)

Upstream sensors - 12583804 or 213-3866 (same item)

I wanted to add to this. I just changed both my upstream sensors, I noticed the tips were different with the new Denso sensors. The sensors I removed only had a few holes near the tip, but the denso had numerous holes the full length of the tip.

How much different are these, if any...not sure of these are a suitable direct swap.

Mine are: Delphi ES20013 and have the 12583804 as an interchangeable item but that's not 100%.

2012 GMC YUKON XL 1500 6.2L V8 Oxygen (O2) Sensor | RockAuto

RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Easy to use parts catalog.

www.rockauto.com

I will say my driveability is much improved, still need to wait for a full block relearn to calculate MPG

 

[swathdiver]

I wanted to add to this. I just changed both my upstream sensors, I noticed the tips were different with the new Denso sensors. The sensors I removed only had a few holes near the tip, but the denso had numerous holes the full length of the tip.

How much different are these, if any...not sure of these are a suitable direct swap.

Mine are: Delphi ES20013 and have the 12583804 as an interchangeable item but that's not 100%.

I will say my driveability is much improved, still need to wait for a full block relearn to calculate MPG

Cool, keep us posted.

 

[dkad260]

Cool, keep us posted.

Will do, I agree with you when dealing with electrical components to keep it OE. I couldn't find the OE on Rock Auto, so I will surely monitor economy and driveability, any hit on MPG they are coming out for sure.

First two drives have been very favorable though. I will start another thread as my brief history with the failing bank 1 sensor was different from past experiences.