I know this is an old thread...but I wonder if anyone tried the circuits g_murray posted on 01-29-2006.
I'm a EE; FETs with low RDS-on will be a much better choice than the bipolar 2N2222s shown. The upper circuit will be preferable because even Schottky diodes have excessive forward drop.

If you've had any experience with these, please let me know. If I can help someone give it a try, let me know. My 993 is OK for now, but I know it's just a matter of time.

Ron

 

Am I missing something?!?
Did this post find resolution and was a successful bypass circuit created? If so, I am interested in purchasing and installing one.

 

I have had the dreaded SAI fault for years now. A friend built a "device" for me, but just as I was going to test it, an o2 sensor heater fault blocked my testing. I decided to replace all 4 o2 sensors and magically NO MORE 2a SAI FAULT!!!

All my readiness codes are set and I passed emissions. 200+ miles and I am still in the clear.

Do you think the old sensors were clogged up or no longer sensitive enough to detect oxygen? $350 in sensors and the pain and suffering to torch the old ones loose was well worth it compared to a $6k top end rebuild. (My respect for Porsche is definitely diminished for Stuttgart not standing behind this design flaw and turning their backs on us!!)

Jim
Seattle

 

Bumping this ancient thread.

Does anyone know anyone (without giving names) who has been successful with the defeat circuit documented above? Looks simple to create...

Thanks