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 ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-16-2002, 01:45 PM
Registered User
 
Join Date: Jul 2002
Location: Trenton, NJ
Posts: 248
Question W126 O2 Sensor Connection

I'm hoping to replace the O2 sensor in my '87 560SEL later this week. The service manual CD indicates that the connection is somewhere in the passenger's footwell. I've looked a bit but didn't see anything that looked right. Can someone help me identify the right location and set of connectors?

Thanks in advance.

Jeff
Reply With Quote
  #2  
Old 07-16-2002, 03:05 PM
it leaks, its german
 
Join Date: Mar 2002
Location: raleigh nc
Posts: 1,111
passenger floor, close to the seat. some have 2 connectors, one for the ehater and one for the sensor (single wire for sensor, 2 wire for heater.) Sure fire way to find it, puch the grommet through the floor and go to the coresponding place inside and follow the wires. :-)


Joe
__________________
Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
919-881-0364
Reply With Quote
  #3  
Old 07-16-2002, 04:29 PM
Registered User
 
Join Date: Oct 2001
Location: Atlanta Ga
Posts: 281
yep, joe's got it right...I just replaced one on a buddy's '89 560 about 4 months or so ago and its pretty easy. You'll need a 10mm (or it might be 12mm-trying to remember) to remove the false wall under the carpeting mat on the passenger side and you'll see it to your left in the footwell area. Just unplug and push the rubber grommet thru. Getting the new rubber grommet thru the access hole is probably the only b-tch part about replacing it because of its "newness" so just put the new O2 rubber grommet in some hot water and it should soften up enough to work into the hole ** (I later ended up using some K-Y lubricant when we did my 560 2 weeks ago which worked like a charm believe it or not-worked better than the water and was quicker!)

You'll also need a 22mm open/box combo wrench to remove the sensor,13mm to slightly loosen the tranny bolts enough to free the wire from the heatsheild, and if you have to loosen your crossmember, there's 6 bolts and they take a 17mm (although I didn't have to do the crossmember thing that some would probably recommend--I just manuevered to get to the sensor). The rest is pretty much a no brainer as you will see when you get into doing the job. Took me just a bit over 2 hours ( with b.s.ing around in the garage and in and out of the house "snacking"). You should be fine. Good Luck and keep us informed.

Alan
__________________
1997 E320
1986 560SEL
1983 300SD
1972 220D
1970 250C SOLD
1971 250C SOLD
Reply With Quote
  #4  
Old 07-17-2002, 12:10 PM
Registered User
 
Join Date: Jul 2002
Location: Trenton, NJ
Posts: 248
Alan,

Thanks for the quick and detailed reply. Last night I was able to locate the connection by carefully pulling on the wire from below while my wife felt around inside to see what was being moved (no funny interpretations here folks :-) It was right in front of me all along I just didn't recognize it.

I hooked my meter up to it for a short while and got ~.8V with some fluctuation. Tonight I'm going to try to rig it up so I can monitor it for a longer period while driving.

One interesting side note - the O2 sensor light only came one of the times that I had the unit disconnected and then only after several minutes.

jlc
Reply With Quote
  #5  
Old 07-17-2002, 12:18 PM
Registered User
 
Join Date: Oct 2001
Location: Atlanta Ga
Posts: 281
good work dude! If you have the new 02, you may as well go ahead and replace it...good luck
__________________
1997 E320
1986 560SEL
1983 300SD
1972 220D
1970 250C SOLD
1971 250C SOLD
Reply With Quote
  #6  
Old 07-17-2002, 10:38 PM
420benz's Avatar
Registered User
 
Join Date: Jul 2001
Posts: 961
Is the 02sensor on my 89 420 sel in the same place?
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 12:14 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page