Has anyone used this method and produced the charts to go along with it? I have 3 charts all showing different snap shots of my O2 sensor functioning. The first chart (car idling in park) shows Max voltage at .83 and Min at .15 When looking at the oscillation pattern, all the peaks aren't smooth but they are pretty equal in hieght and width. Occasionally, the peak becomes rigid but not distorted. After the car is put into gear (foot on the break), The oscillation patter changes drastically. The peaks and vallies are not the same height, they more rigid and become closer together (increased frequency of oscillation). At this point, the Max voltage value is .86 and the Min value is .11

The final graph (car driving down the road) shows even more frequency of oscillation (peaks and vallies are even closer together) and they are not uniform in hieght or width. At this point the Max voltage is .85 and the Min is .18

My question is, how normal is this? I find it hard to believe that I still have a functioning original lamda sensor at 193000 miles.

Thanks,