very nice bit of testing the sensor, from the graphical output, looks like it is good (assume you mean K ohms on the first?). There is very little left that you havent tested by now so hope its the O2 sensor! just a stupid question but you have tested the wiring and bulb to the idiot light to make sure some Previous Owner hasn't cut it?
cheers
barri

__________________
61 Austin mini
67 Lotus 7
74 450sl
76 Cadillac 8.2l (501 ci)

some new cars

megasquirt conversion on:
djet 74 450sl http://www.mercdjetmegasquirt.britautorepair.com/
cis 76 450sl http://www.merccismegasquirt.britautorepair.com/

the best view is always from the point of no return