All I can tell you is that sway control defaults to on all the time. You have to turn it off every time you crank up. I actually felt the brakes release when I turned it off on the interstate. Mileage immediately went up.
I assume there are some kind of rate sensors in the rear of the truck that detect sway.
I know based on my experience that it was activated and I had no trailer connected. I would assume it is there for when you have a heavy load in the bed as well to help prevent rear sway.

As for the 02 Sensor, mine was fine. Not my problem w/ poor economy but could be on others.

 

Thank you truckerdude for supplied info. It reiterates what I was trying to get across. Thomastl---I really could not tell any difference when I deactivated mine. On your pickup maybe there is something wrong and it did make a big difference. I could not tell any difference.

 

Yes, thanks for that comeback. My 02 sensor is also find. It was the computer, they reset
it, I am back getting 22 on highway @ 65mph. Happy camper again!

 

Can you find out what version you had reloaded on the ECU or PCM?

 

Basicly they are stating reprogram the Powertrain Control Module (PCM)
using IDS release 75.03 and higher, whatever that means. Using the IDS tool, clear the transmission adaptive table, and perform adaptive drive cycle. Condition Code 04. Hope that helps! What happened to the good
old days when you worked on your truck in the back yard, with a timing
light and dwell meter.

 

Those days are gone ! No more shade tree mechanics.