Wednesday I swapped mufflers and had the bung for the wideband sensor welded in. Drove home and it sat till I drove to work Thursday. Was fine to and from work Thursday but around town running errands it threw an SES light. Drove home and didn't scan it. Got in Friday morning and the light was off, drove less than a mile to get some gas and the light came on so I swung back home and got the laptop and scanned it. Came up with P1071 and P1074. Cleared them and didt come back the rest of the drive, came back on after work and I cleared it again. Havent driven the truck or even started it today.

Any ideas?