donjetman
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Pics are in the following thresd:
https://www.tahoeyukonforum.com/thr...-cold-berryman-b12.120184/page-2#post-1469315
Probably need new O2 sensors?
- Thread starter Coolman1987us
- Start date
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https://www.tahoeyukonforum.com/thr...-cold-berryman-b12.120184/page-2#post-1469315
Yes. Upstream is pre-cat and reports to the PCM so it can adjust fuel trims.
EddieC
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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.
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.
Last edited:
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
Full Access Member
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.
You asked me to keep us posted, and after my 1st long road trip with the Delphi upstream O2 sensors, I noticed about a 15% drop in MPG for the whole trip down. I could easily get 19.5-20 MPG on the DIC, real world about 19. This trip has been about 17 MPG.
The values (voltages) on the torque app seem good, but doesn't take much and I think I will swap them for OE sensors after this trip for confirmation.
Joseph Garcia
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Thank you for your update. Much appreciated.
swathdiver
Full Access Member
Decades ago, we figured out that changing oxygen sensors picked up a little power and bettered our mpgs as well. That was with 1 wire sensors so maybe it's still a thing. Keep us posted, again!
I have read that when o2 sensors foul they drift lean, so the engine adds more fuel. which happened much faster with the only 1 wire non heated ones.
the ecm then takes that added amount of fuel from the long term trims and adds it blindly to the PE mode fueling math. which is already overly rich from the factory.
same applys to most stuff today, but the sensors are much better and last forever and have more of them. back in the obd1 days you only had one and it died in 80k
the ecm then takes that added amount of fuel from the long term trims and adds it blindly to the PE mode fueling math. which is already overly rich from the factory.
same applys to most stuff today, but the sensors are much better and last forever and have more of them. back in the obd1 days you only had one and it died in 80k
