Figured out what was causing HIGH long term fuel trims...

[BG1988]

Under load at 1800 rpm my long term Fuel trims are now at 0.0-0.8 for both banks
normal driving 1100-1200rpm 2.3 stable for miles at a time..

tiny green o ring on the intake snorkel ( the vacuum line entering from the passenger side) worn out, dry and dirty...

I have been chasing this for a while I cleaned it up a bit and it's making a better Seal... but does anyone know the part number so i can replace it with a new one

 

[OR VietVet]

Maybe post the last 8 of the VIN and see if @915_Tahoe can help.

The last time I worked on a vehicle, Tundra, where both sides O2 sensors readings were suddenly effected, it was a vacuum leak, too.

 

[swathdiver]

My O-Ring on that side is blue if we're talking about the same thing.