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Old 02-08-2008, 08:02 PM
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Join Date: Oct 2002
Posts: 67
O2 Sensor replacement '88 300E

Is this a DIY kinda job? It looks straight forward enough... is there a trick to guiding the floorboard type bushing into it's hole?



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Old 02-08-2008, 08:19 PM
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Join Date: Aug 2007
Location: Sealy, Texas
Posts: 58
Just did that job the other day.
Un plug the sensor wire under passenger carpet, attach a string to the lead so you have something to pull the new lead through with, then push it thru. the floor so it is outside the car. The wire needs to rotate with the 02 sensor as you unscrew it or it keeps winding itself back into its threads as the wire trys to uncoil itself. I found it easier to thread the wire connector through the ring end of the wrench (22mm) and loosening from the passenger side of the exhaust. My wrench has a slight angle to it and I was able to get a good purchase on the 02 sensor. Once its out replace with new 02 sensor after attaching the pull string to the leads. Once the cable enters the car the rubber grommet can be fed into the hole.
This explanaition was too long but I hope you gat the idea.

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Old 02-08-2008, 08:27 PM
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Join Date: Oct 2002
Posts: 67
jackstands will be enough to get to the O2 sufficiently and working the grommet into its hole... with a screwdriver or what?

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Old 02-08-2008, 09:48 PM
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Join Date: Oct 2004
Location: Baton Rouge La
Posts: 2,632
i didn't even you jackstands.....

sort of fiddled with a screwdriver..... i used a generic three wire it was more of a pain splicing the wires together.... but the sensor was less thand 30 dollars... and now i get 3 more miles to the gallon...
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k

1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it

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Old 02-09-2008, 06:46 AM
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Join Date: Aug 2002
Location: Southeastern PA
Posts: 3,053
carnac, automotive stores sell an offset wrench (basically an open end wrench with a slot) for installation/removal of Oxygen sensors. The wrench costs around $10 and fits over the electrical lead. Remove the passenger side carpet insert and unplug the electrical lead. From below the car push the grommet into the passenger compartment so the electrical lead is free and clear. Then unscrew the Oxygen sensor and remove. Installation of new Oxygen sensor is reverse order. Make sure there is a coating of Never-Seeze on the Oxygen sensor threads ... makes removal the next time much easier.
Fred Hoelzle
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Old 02-12-2008, 02:42 PM
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Join Date: Apr 2002
Location: westchester, ny
Posts: 747
I found access much easier from the passenger side after I removed the brackets and supports around the exhaust pipes. Autozone has the socket under its free loaner program.
87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)
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Old 02-12-2008, 02:43 PM
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Join Date: Jun 2006
Location: Chandler, Arizona
Posts: 3,523
I just did it 2 weeks ago on my 300TE.

It was pretty straight forward.
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k
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Old 02-13-2008, 02:56 AM
Join Date: Jul 2006
Location: Sacramento, California
Posts: 107
I posted this a few weeks ago. I think you have an M103 as well so should be the same. Even if you have a different engine the basics should apply.

w126 02 sensor replacement/intallation
Eric Zacharias

'88 300 SEL
'64 Ford Falcon
'99 Infiniti QX4
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Old 02-17-2009, 05:20 PM
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Join Date: Oct 2008
Posts: 88
Great info - thanks very much, I need to do this too.
Does the new sensor need to be installed with a torque wrench, or how tight should it be?

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