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#1
04-03-2010, 10:40 AM
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4-wire Oxygen Sensor models
I need to replace my O2 sensor 'again', due to code 9 (high volatge on 02S)...
quick question: Does it matter what the specific number/ model of the sensor is? or is it only a matter of how many wires it has? I am not talking about the OEM fit of course, but universals.... I am looking at some Bosch universal 4 wires with the quick-connect thingy.....as the model number changes, so do the prices....but they are all 4 wires....so what is the difference? and does it matter? thanks,
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1993 300E, 2.8 M104 ..... 
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#4
04-05-2010, 08:51 AM
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There are about 25 different "universal" O2 sensors!
Make sure to get the correct "universal" oxygen sensor! They are NOT the same.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#5
04-05-2010, 10:18 AM
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Quote:
I ordered the correct universal one for the car according to Bosch website following your advice. What made me even more convinced is that I just inspected my old sensor which is two months old, thinking that i have a bad connection...but no, my connection is fine....i am getting a high Os2 voltage error because it seems it is not the correct Bosch sensor... thanks for the help
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1993 300E, 2.8 M104 .....
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#6
04-05-2010, 12:23 PM
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Most likely you do have the incorrect universal sensor!
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#7
08-08-2010, 01:50 PM
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HA! "incorrect universal sensor" BOSCH universal oxygen sensor?
I, too, seek the magical UNIVERSAL O2 SENSOR. Climbed the mountain ("searched" many times), found the GURU (M.B.DOC), now the question is so close to being answered!
MY car is '96 E320 [and VW 1.8T (has 2 o2 sensors)]. 15738?? I understand there may not be an answer mortals can comprehend. Did I say I love MERCEDESSHOP.COM!! (OOPS, peachyparts) Wait there's a couple guys at the door driving a black S-class - wow the windshield sure is thick - it's a guard edition I think! hey theyre breaking dwn th d
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RIP "Betsy" (Oo=*=oO) '96 E 3 2 0 (W 2 1 0) M 1 0 4 (Totalled) Spaces in sig so as not to screw up the SEARCH; every time someone searches for that MB they don't want my sig! 2004 Audi A8L '98 VW Passat 1.8T 5M '87 Alfa Romeo Milano 2.5L 5M '67 Impala convertible, 327cid
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#9
08-08-2010, 10:17 PM
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4 wire versus 2 wire. Typically the 4 wire are "heated" O2 sensors. They are actually heated up electrically to start working much faster. Ford likes to use them. If you don'y put a heated O2 where one belongs you will have cold engine issues. 4 wire are usually used upstream (pre-cat). Any O2 sensor after a cat does NOT affect engine fuel tables/performance (not that I have ever seen anyway). They are generally non-heated and there to just make sure the cats are working.
So when replacing O2 sensors on vehicles with multiple sensors, replacing just the upstream ones can save time and money. The downstream ones are "protected" by the cats and last much longer.
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