Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-17-2008, 03:02 PM
EZ
 
Join Date: Jul 2006
Location: Sacramento, California
Posts: 107
w126 02 sensor replacement/installation

I'd been meaning to do something about the fluctuating idle when coming to a stop on my 1988 300 SEL for some time. When the CEL came on briefly a month or so ago and indicated oxygen sensor, I decided the time was now. I just finished the job. Pretty simple really, but I hadn't found a true write-up on the the forum so I thought I'd put down my thoughts. My idle is much smoother now, and I am very pleased with the results.

I have read that you can buy universal or oxygen sensors for other cars that are cheaper and splice the wires in. I didn't really feel like doing that. The bosch o2 sensor was only 80 bucks so I figured it was worth it to make the job easier. Supposedly these need to be replaced every 60,000 miles. My car has 112,00 and I don't think it had ever been changed.

The following is for a w126, it seems similar on other cars, but I'd check first.

1. Lift up carpet on front passenger side. You'll see the black plastic panel in the picture below. Remove the 10mm nut holding it in place and take out plastic panel.

2. In the next picture you see a set of wires in the bottom left side of passenger footwell. Disconnect both sets of wires. Follow them up to bottom edge of left sidewall where you'll see a black rubber plug. Push this plug out followed by the wires until they are entirely through the hole.

3. I found it easier to access the oxygen sensor from the driver side of car. I just slid under the car, didn't bother jacking it up. Right about where the two sets of exhaust tubing join you will see a wire leading into the top of the Y like in the next two pictures. This is your o2 sensor.

4. I went to autozone and rented the o2 sensor socket. It's free as long as you return it and it has a notch in the side to allow the wire to pass through, making the job that much easier.

5. I had sprayed the nut with PB blast the day before to loosen it up and I drove the car for 10 minutes prior to starting to warm up the sensor for easier removal.

6. Unscrew sensor, put on new one. Make sure to use anti-seize in case you ever need to replace again.

7. Put everything back together.

Attached Thumbnails
w126 02 sensor replacement/intallation-img_6401.jpg   w126 02 sensor replacement/intallation-img_6399.jpg   w126 02 sensor replacement/intallation-img_6403.jpg   w126 02 sensor replacement/intallation-img_6402.jpg   w126 02 sensor replacement/intallation-img_6405.jpg  

__________________
Eric Zacharias

'88 300 SEL
'64 Ford Falcon
'99 Infiniti QX4

Last edited by ericzacha; 01-17-2008 at 03:09 PM.
Reply With Quote
  #2  
Old 01-17-2008, 08:58 PM
Hit Man X's Avatar
I LOVE BRUNETTES
 
Join Date: Sep 2004
Location: FUNKYTOWN
Posts: 9,087
Thumbs up

Nice job. I have my O2 layin around for my 300sel to install when I can remember to do it.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.
[/IMG]
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 05:39 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page