Downstream O 2 Sensor

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cschmitz20

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On my 2003 Audi A4 cabriolet. How can you tell which is the downstream o2 sensor on bank 1? I see the diagram lists heated sensors and just regular ones. And I have a 3 way ? What the heck is that?
 
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cschmitz20

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On my 2003 Audi A4 cabriolet. How can you tell which is the downstream o2 sensor on bank 1? I see the diagram lists heated sensors and just regular ones. And I have a 3 way ? What the heck is that?
Trying to do some testing.
 
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Uwe

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What engine does this car have? If it's a V6 it has two cylinder banks. If it's a 4-cylinder, it only has one bank and the "downstream" oxygen sensor for bank 1 is the sensor furthest from the engine.

-Uwe-
 
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cschmitz20

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Yea it’s the 6 cylinder. It is the AVK engine
 
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cschmitz20

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And just want to make sure I’m on the right bank. I’m looking at bank 1 . Which in the us. Is that the drivers side? Also when I’m looking down on bank 1. I can see 1 sensor right in the middle of the cat. Is that the downstream one?
 
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