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Old 03-21-2008, 03:42 AM
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Join Date: Feb 2002
Location: Seattle WA
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Universal O2 Sensors

I am planning to replace all four O2 sensors on my C43. The Bosch universal part# for all, before and after CAT, is 15738. My question is, are the sensors all the same. How come Bosch has separate part#'s for all four, 15088, 15090, 15092, 15094. I know that the universal needs to be spliced, but other that that, what's the difference? The universals are much cheaper.

1991 190E 2.3 SOLD
1972 911t 2.4 owned since 4/80 300,000+ miles SOLD
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Merlin XLM, All Ti, 17.5lbs.
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Old 03-21-2008, 05:06 AM
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Why replace the rears? They don't do anything for the cruise A/F ratio... they're only for cat efficiency.
I'm not a doctor, but I'll have a look.

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Old 03-21-2008, 05:43 AM
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Once you find an answer for your orig question, let me know what purpose replacing a non-faulty o2 sensor serves. Mine are original and I was thinking of doing the same, but not sure what kind of situations it would improve/remedy
former: 83 300D, 97 C230, 93 400E

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Old 03-21-2008, 09:07 AM
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Location: Tucker, Ga USA
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The ONLY difference ON THAT car is the length of the wires.

The actual sensor is the same foe all 4 locations.
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Old 03-21-2008, 09:43 AM
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I replaced two of the four on my wife's Expedition. I used universal ones with different part numbers and the only difference was the length of the wires. It didn't matter anyway as I used some of the wiring from the old sensor.

I was told that an O2 sensor will start to go bad slowly until a code is sent. If your O2 sensors have over 75,000 miles I bet they can be replaced and you will see results.
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Old 03-21-2008, 02:09 PM
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Location: Ontario, Canada
Posts: 3,160
O2 sensors are considered Maintenance items.
As they get old, they tend to move slower & slower, i.e. the transition speed between lean/rich slows down.
This can result in a reduction of fueleconomy.
I'm well aware there are people that would not consider changing these, until they see the Check Engine light on.
2007 C 230 Sport.
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Old 03-21-2008, 03:35 PM
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Location: Baton Rouge La
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my 02 sensor in the 88 260e was causing the light to come on about a mile down the road. it would then go out shortly later.

i noticed my highway mileage had dropped to 19. changed the sensor with a universal. highway mileage now back up to 24.5
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Old 03-21-2008, 09:17 PM
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If you look around, you may find sensors considerably less-expensive than the "universal." I have not tried this with 4-wire sensors, but for the single-wire type used on 380's and 560's, I used a sensor for a '90 Mustang. IIRC, the universal were like $35, and the Mustang less than $20. You just cut the end off and supply your own connectors and heat shrink.

Chuck Taylor
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Last edited by ctaylor738; 03-22-2008 at 12:58 PM.
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