[Formulajones]

A much easier way to test the 02 when the car is running poorly is to just simply put the car in open loop taking the 02 completely out of the fuel equation. Providing you have a good base fuel map.

Actually, many of us keep an open loop tune stored on the SD card so that in the event we might have an 02 failure while out and about, it's pretty simple to just pull over, swap in the open loop tune on the hand held, and drive on. As long as the base fuel map has a solid tune in it, it'll run fine, providing it's actually an 02 problem to start with.