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#1
08-25-2011, 10:33 PM
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02 sensor replacement
What is the recommended replacement interval for the o2 sensor? My car has the original one and I'm thinking it wouldn't hurt to replace it. Where is the o2 located and how do I go about replacement ie. where is the harness connector located.
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1989 300CE 
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#2
08-26-2011, 07:00 AM
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If it was like my 95 W124, it is under the passenger carpet, and then under a black plastic shield or housing IIRC.
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Prost! 
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#3
08-26-2011, 08:26 AM
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If it is still working?? WHY replace a good part?
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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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#4
08-26-2011, 08:59 AM
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Bosch recommends 100K on O2 sensors. I agree about replacing parts that are 'broken' but it's hard to test O2 sensors.
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Good luck. 1998 E320 Wagon
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