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Its not the sensor
Posted: Sat Oct 31, 2020 7:58 pm
by DCIV
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
Re: Its not the sensor
Posted: Sat Oct 31, 2020 11:05 pm
by vr4
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.
Re: Its not the sensor
Posted: Sun Nov 01, 2020 1:30 am
by DCIV
Delete the front O2’s, can you do that?
What is b+
Coop
Re: Its not the sensor
Posted: Sun Nov 01, 2020 3:39 pm
by mjannusch
[quote=""DCIV""]What is b+[/quote]
Battery Positive
Re: Its not the sensor
Posted: Fri Nov 06, 2020 2:17 pm
by DCIV
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