O2 sensor help...

[Hozer 88GTConv]

touchdown!
KOER CODES
41 EGO voltage always lean, does not switch
33 egr (long gone too, with thermactor, no worries)
91 EGO always lean

now, I'm going to check the voltages at the ecm at the pins
49 gnd
43 and 29

thanks Joel, I will also check pin 8 for 12 vdc...

[Hozer 88GTConv]

the problem definitely seems to be around that harness connector in front of the passenger strut tower.

I checked the dark blue/green signal wire for the left EGO before the connector and it was around .5 vdc at idle, after the connector, barely anything .04 vdc-ish. I noticed while fumbling the wires around that I got a temporary signal to the pms for the left ego, and then it slowly discharged.
I don't know much about these connectors, and didn't think they could crap out like this. I am now going to cut the signal wire for the left ego and make a new bullet connector for it to test it out.

it would be nice if this is it...

[Hozer 88GTConv]

I can't bypass that connector.
I wired the corresponding signal wires from both 02's directly to their corresponding wires past the connector on the strut tower.
That isn't working. I get voltage right at the newly severed wire ends showing how bloody rich I'm running, but for some reason, that doesn't translate directly to a signal to the computer.
Does the connector do something else, besides the obvious?
Yes, I know nothing about electricity.

[Joel5.0]

Nope....it simply "connects", no resistors, diodes, capacitors...nothing. To clear one doubt,...are you checking the O2 signals right at the ECM connector wires? .....did you pierce the O2 wires as near as possible to the ECM connector? (sorry, two doubts). LUK

[Hozer 88GTConv]

Okay,
now i just checked the o2 signal from each sensor by taking a reading from the pierced upper left white wire on each sensor harness while the car was running and at operating temp.
Only got .4 volts ish on the left and 1.4 vdc on the right.

they are only three wire 02's, so I'm interpolating the chart.

Going to do the key off test now, I'm going to be p-od if I ruined these 02's already.

[Hozer 88GTConv]

got no voltage on the upper left,
got .67 vdc on the black and got an intermittent 12vdc on the upper right...

sound right? sounds like the 02 is bad...good power, just no signal.

[Hozer 88GTConv]

replaced 'em again. no change...checking for voltage at pcm
I used bosch 02's from advance auto parts.
going to do a continuity check too from the sensors to the harness...

[Joel5.0]

Originally Posted by Hozer 88GTConv

got no voltage on the upper left,
got .67 vdc on the black and got an intermittent 12vdc on the upper right...

sound right? sounds like the 02 is bad...good power, just no signal.

If this is your key on engine off results, the .67vdc(rich) shouldn't be there.

The 12vdc is in the O2's for heating purposes only, not for signal voltage generation. They react to the presence (or absence) of oxygen in the stream and generate the voltage signal. If engine is off and after a short period of time, the signal voltage from the O2's should be very close to 0.0vdc=very lean=no exhaust fumes.
Check this tech article on its description. Even though it's Audi related, it is a very good description of the O2 sensor.

I think your problem is more a wiring issue first, and a possible set of bad O2's second. Once you get the wiring problem squared and replace the O2's, check them out in a KOER self-test. LUK/GL