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Old 10-08-2000, 12:02 AM
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I don't have any manuals for my 92 500 sl. Where is the oxygen sensor? Secondly, how do I find one that is reasonably priced? I also read about oxygen sensors for other cars that were modified to fit mercedes. Any down sides to this method? and, which one will fit a 92 500 sl? I am getting ridiculous quotes on them, $175-$300!! That's just for parts.


This is an awesome site. I have never learned so much about cars in 4 days.
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Old 10-08-2000, 11:03 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
I wouldn't replace such an expensive sensor unless it needed it. Then I would use what was designed specifically for that application. The differences between applications is significant.

You should be able to buy a Bosch sensor (original equiptment)from many sources other than the dealer (including PartsShop). Get a good price for a quality replacement; thats the best deal.
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Old 10-08-2000, 12:46 PM
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The car has 79568 miles on it. Is it due for one or wait for it to go out? How can I tell when it is out?

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Old 10-08-2000, 01:05 PM
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The O2 sensor should not be replaced unless it's causing problems. If Cal vehicle, you would a check engine light, however the best way is to have some one check the on/off ratio, basically make sure it's in closed loop. If it is, don't even worry about the thing.

Mercedes-Benz Master Guild - 2 years
Shop Foreman - 20 + years - dealer.
Part owner - MBZ Transmission remanufacture
2000 SL500
1995 E320
1989 300SE
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Old 10-09-2000, 07:35 AM
Join Date: Sep 2000
Location: Sugarland, TX
Posts: 285
The O2 sensor (you may have two) is located before and after the cat on your exhaust system. They break more often then older cars, I replaced mine bout 65K. When the O2 sensor fail, your “Check Engine” will stay on. If you are MBCA member, you can write to George Murphy, he have a modification with to use of the Ford Mustang O2 sensor.

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