O2 #s lean

[Bigjack7440]

I ran some 116 mixed with 110 oct last week and now (not all the time) i see some lean #s on the o2 side of my scanmaster. Like 500 at wob . Sometimes its fine like 777 with 0.0 knock @23lbs boost. You guys think it might be time for a new 02 snsor? Remember it never use to do this and it does not do it all the time. Thanks for your help.

 

[ghall]

Yep, sounds like an o2, i have had real good luck with Denso o2's w/ race gas!!!

 

[toomanymodz]

Yep, sounds like an o2, i have had real good luck with Denso o2's w/ race gas!!!

Are you using this one:
Denso automotive parts available online at DensoProducts.com

I wonder how that one compares to a heated 02. I'm using Casper's and it survived 110 leaded for a very long time.