Its not the sensor

DCIV · Post by **DCIV** » Sat Oct 31, 2020 7:58 pm

Replaced my bank 1 sensor 1 o2 twice now, first time was amazon with good reviews but came in correct package....figured it was just wrong part, bought one from GM...still code. P0134/0135. Fuses are good. O2 doesnt cycle, keeps the truck in open loop....what am I missing.

Coop

vr4 · Post by **vr4** » Sat Oct 31, 2020 11:05 pm

It's a very simple circuit. Check for b+. Check for ground from the pcm when the heater is commanded on. Check continuity on the other 2 wires from the sensor to the pcm. If all 4 check out, all pcm grounds to body are clean and tight, you need a pcm.

Or just delete them.

DCIV · Post by **DCIV** » Sun Nov 01, 2020 1:30 am

Delete the front O2’s, can you do that?

What is b+

Coop

mjannusch · Post by **mjannusch** » Sun Nov 01, 2020 3:39 pm

[quote=""DCIV""]What is b+[/quote]
Battery Positive

DCIV · Post by **DCIV** » Fri Nov 06, 2020 2:17 pm

Confirmed through jeff and Chevy dealer that I did in fact put the correct o2 sensor in....it’s Deff not the sensor.

So I’m at the point I need to pay someone to figure it out. Son of a dog.

Coop

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