I think the O2 sensor should be working, because it is new. The car has been gone over by a very good mechanic, Ernie in Orangevale, CA, who thinks it is basically running correctly, and I agree. (A lot of work was done, and an effort was made to replace every defective unit on the engine, unless we missed something). The smog shop man said it is running really nice and smooth, and the only reason it didn't pass is because it needs a new cat. The gas mileage is good.

Every time the smog man leaned it out a little, it came closer to passing. I'm wondering if maybe he just got tired of dicking with it.