What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[Grady_Wilson]

Just got done swapping both upstream O2 sensors.
No codes, just 162k on the originals and I know older O2 sensors get 'lazy' and tend to not meter as well.
Started her up and it seemed to idle a little smoother.
We'll see if I get better drivability or more MPGs.

Driver side was the one that is harder to get to, being as the front driveshaft is pretty much in the way.
That one broke loose without too much drama using my O2 sensor socket and a wrench on the end.

Passenger side I could use my ratchet but I needed to use a big breaker bar with a cheater pipe on the end to get it to break loose.

 

[Doubeleive]

Just got done swapping both upstream O2 sensors.
No codes, just 162k on the originals and I know older O2 sensors get 'lazy' and tend to not meter as well.
Started her up and it seemed to idle a little smoother.
We'll see if I get better drivability or more MPGs.

Driver side was the one that is harder to get to, being as the front driveshaft is pretty much in the way.
That one broke loose without too much drama using my O2 sensor socket and a wrench on the end.

Passenger side I could use my ratchet but I needed to use a big breaker bar with a cheater pipe on the end to get it to break loose.

You should clear the obd system when replacing the 02 sensors so it can relearn the new ones properly, even if you did not have any codes or problems
so either disconnect the battery use a scanner

 

[Grady_Wilson]

You should clear the obd system when replacing the 02 sensors so it can relearn the new ones properly, even if you did not have any codes or problems
so either disconnect the battery use a scanner

I took a short drive and it seemed to drive much better.
Will clear everything in the morning with my scanner.
Thanks for the heads up.