EGT and O2 issues

[Zackattack]

Merry Christmas to those who celebrate,

I have been trying to troubleshoot a recent issue with a CEL on my car.

17526 - B1S2 open circuit
17522 - B1S2 internal resistance too high

I found a dead O2 sensor but using the schematic it says that the B1S2 O2 sensor is the beige connector behind the drivers side coolant reservoir. I tested this sensor and it tested fine. The green connector on the passenger side is the sensor that I found to be dead; could the schematic just have the sensors confused? It just lists them as S1 and S2 but all the wire colors match. I'm going to buy an O2 and install it but just wanted to double check this first.

The other issue is:

17861 - EGT sensor 1 open or short to plus - intermittent

I tested both sensors today and both tested fine, no issues. There was a lot of what looked like metallic black debris inside the connector of the black EGT (which from what I've read is the #1 bank sensor). I cleaned everything but the problem persists. I opened measuring blocks and watched the EGT from both sensors and the temp was measuring fine from both; but sensor one has "Test OFF" under lambda aging and 0.00s as the dynamic factor while bank 2 has B2-S1 OK under aging and .64s under dynamic. Has anyone ever seen this before? How can the sensor test and read ok but still have a fault?

Any help is appreciated.

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[chris86vw]

Bank 1 is the passenger side

Measuring block 034 is cat temp from an o2 sensor and not the egt sensor.

For the egt you can buy new sensors, buy new boards (requires opening and soldering) or attempt to open and see if there is just a broken solder point on the current egt board.

[Zackattack]

I thought the words "catalytic converter bank # temp" was a little odd. Are there measuring blocks for EGT? I just opened up the sensor and although I couldn't see any broken connections I soldiered them all anyways. Started the car and no EGT fault returned. The 17526 fault went away too, first time this has happened after starting. The 17526 heater fault came back. haven't driven the car around yet but all of those faults occurred instantly when I started the vehicle previously.

So the Green plug on the passenger side is for the passenger side downstream O2 then right? The wires lay on top of the transmission and are clipped on there, I don't see any way to trace them without ringing them out and that would require cutting the sensor wire from the sensor. Trying to save myself some time and replace the correct one the first time.

[chris86vw]

black/black are the front sensors

and green/brown are the rear sensors.

So yes green on passenger(right) firewall is the B1S2 connector.