So my car has a stumble when warm, so I scanned it and the o2s were way off from each other. I just replaced them and scanned it again. The first scan I got L and R at 448, then l778/r633, l888/805, l919/r853 in open loop, l145/r677, l250/r579 in closed. where should I go now?

 

Right and left o2 sensorys are not supposed to by in sync with each other. Thats the whole idea of having one o2 sensor on each side of the engine.. because one side of the engine burns alittle better or worse then the other. This is to help correct that.

When you scan them... Look at each side individually. In open loop they should hang around the same number continuously. Not neccisarily the same number as the other side of the engine though.

Each sensor should range from a very low number, say 100, to a high number like 950? it should bounce back and forth. each o2 sensor will do so on its own.

Are you running extra rich or lean?