OK folks, here's a Great shop training class video in depth on Oxygen Sensors. Instructor teaches basics of O2's, and how they integrate with fuel trims and other details. Essential knowledge to understand the workings of this critical system on all modern vehicles!
Been posted before I think, but here it is again!
Tracy G
Tracy Gallaway
Founder and Constant Aide to Gadgetman
Gadgetman Reno, NV