purchase a new ECU only to find it was a wiring problem. Also, is there a relay for the ECU?

<ul><li><a href="http://tomasz.data2net.org/audi.b5.wd.34.pdf">http://tomasz.data2net.org/audi.b5.wd.34.pdf</a</li></ul>

driver's side pre cat 02 sensor. This will make it about 1000 times easier.

I'll tell you exactly what pins to connect to. You'll need to cut the O2 signal wire at the ECU and also splice into the ECU accessory power supply.
You can't use a regular accessory supply, because it it isn't hot during cranking, which will confuse the ECU and throw all kinds of codes.
Edit: Umm, I was thinking of the ARC1 install, not sure about PLX-300 driving the oem O2 signal. Try with regular accessory power and see if you get any errors first, if you do we'll talk more.

hehe, sneaky sneaky

and I don't take orders from mortals ;)

and my mad l33t ctrl-c ctrl-v skillZ

Thanks for the edit. I'll wait till the arc1 gets here before I ask any questions about that.

emailing you about that G1 a while back.

Any other questions, don't hesitate to contact me.