Any interest in SAI delete circuit?

[Gelbster]

Originally Posted by SteelStroke

Okay, count me in. Hopefully goodbye to that on /off again P0420 code.

P0420 is a catalyst inefficiency code as you must have found out ? So the "SAI problem solver" circuit is unlikely to help unless you think this is caused when the SAI does a self check while the engine is warm?? Seems unlikely but what would I know ?
Presume your interest is in the O2 Sensor problem solver circuit ? Me also.My Durametric confirmed it.
If either/both your Cats are beginning to fail, it should be clearly visible on Durametric because the wave form seen on the Pre-Cat Voltage graph will not be smoothed out by the cat & the Post-Cat O2 sensor will show a lumpy Voltage graph.It should be fairly smooth to 'please' the DME. I have grossly simplified this but here is a link to a pro page on the subject that may be helpful for some:
http://www.aa1car.com/library/o2sensor.htm
So how far have you got with the diagnosis?