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Discussion Starter #1
I was researching for the rear 02 sensor replacement on my 1994 Mercedes E320 wagon. I came across this universal 02 sensor as describe on ebay:
https://www.ebay.com/itm/New-O2-02-Oxygen-Sensor-Universal-4-Wires-For-Lexus-Acura-Honda-Isuzu-GMC-SG450/261706342710?fits=Year%3A1994%7CModel%3AE320%7CSubmodel%3ABase%7CEngine+-+Liter_Display%3A3.2L%7CMake%3AMercedes-Benz%7CTrim%3ABase+Wagon+4-Door%7CEngine%3A3.2L+3199CC+l6+GAS+DOHC+Naturally+Aspirated&hash=item3ceee9e136:g:nF4AAMXQMTlRb4u2#vi-ilComp

There are four wires on the 02 sensor (see picture on ebay) One black, one gray, and two white wires. When I looked at my old 02 sensor, it has the same color types as the universal 02 sensor. My question is the two whites wires on both the 02 sensors are both the same and does not matter which white wire connected to the rest of the wiring of 02 sensor on my Mercedes as long as the matching color is white? Any comments, feedback/advice is greatly appreciated.
 

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Discussion Starter #6
sbaert, The 02 sensor you put on your last post shows upstream. I am looking for a downstream 02 sensor beyond the catalytic converter. Is there a difference between the upstream and downstream 02 sensor?
 

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Discussion Starter #8
I thought there are two 02 sensors on my 1994 Mercedes E320 wagon. One is upstream before the catalytic converter and the downstream beyond the catalytic converter near the muffler area. Really, just one 02 sensor only?
 

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LOL. These cars are strictly pre OBD2. Multiple O2 sensors only came around well into the OBD2 era.
 

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Discussion Starter #11
sbaert, Thanks a lot for your last post. Now I understand more clearly as to why. Your explanation is very clear and straightforward. Boy oh Boy, I am getting an education here!!! Live and Learn.
 

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I was apprehensive about using universal O2 sensors until one replacement required disassembling nearly half the interior to access the harness. Installed a Denso universal, saved lots of time and about $50, and part is still good after 10 years.
 

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Discussion Starter #13
partnumber187, thanks for your last post. I appreciated it. It is best to get the whole one 02 sensor, not just the universal 4 wire.
 
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