and gain access to Reviews and Discussion of the 2016 and 2017 Ford Explorer Tech Tips, How to Articles, Off-Road Modifications and Events, Street Truck Mods and Events, and much more! Since 1996 our community has covered every aspect of the Ford Explorer, Ford Ranger and all vehicles based on this platform.

Register Today It's free! This box will disappear once registered!

P1131 code on 1999 FORD Explorer XLT SOHC

Discussion in 'Stock 1995 - 2001 Explorers' started by bbrizendine, February 16, 2009.

  • Searches ExplorerForum.com
    1. bbrizendine

      bbrizendine New Member

      Joined:
      February 16, 2009
      Messages:
      1
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Silver Spring, MD
      Year and Model:
      1999 Explorer XLT SOHC
      Have cleaned (4 times) MAF and replaced it. Engine still rough with engine light on and P1131 code. Points to 02 sensor. How do I tell which one? Where is it? I found one on left side. Can't find one on right side. I was told that there are 2 above the cat converter and 2 below - right and left side. I think the ones below the cat converter are a different code. If that's true, then how do I tell if it's the right of left one? Note - I'm a decent backyard mechanic, but don't know to use a voltmeter or do auto electric testing. How hard is it to replace?
       
    2. Support EF


      Join the Elite Explorers for $20 a year

      Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose and fix problems yourself, and learn which modifications work without having to experiment on your own. Elite Explorer members see practically no ads, add your own profile photo, upload photo attachments directly to your posts and Media Gallery, create more private Conversations, and more. Join Today. Your support is greatly appreciated.



      to hide adverts.
    3. Sams01XplrSprt

      Sams01XplrSprt Southern Cali Explorer

      Joined:
      November 14, 2004
      Messages:
      15,667
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Newport Beach California & Bay Area California
      Year and Model:
      2001 Sport (sold)
      welcome
       
    4. CDW6212R

      CDW6212R Elite Explorer

      Joined:
      June 17, 2004
      Messages:
      14,398
      Media:
      3
      Albums:
      1
      Likes Received:
      26
      Trophy Points:
      68
      City, State:
      Knoxville, TN
      Year and Model:
      98 Mountaineer AWD
      I replaced my RF O2 sensor about two weeks ago, same code and engine. To get at it, pull the right plastic inner fender out from the back. You can most easily get to it from the side along that back edge of the wheel well. Both of your front O2 sensors are the same part number. I suggest buying the Ford part, it will plug right in. The other brands require building the wiring connection ends, the wires come separate from the connectors.
       
    5. gijoecam

      gijoecam Village Idiot Elite Explorer

      Joined:
      May 31, 1999
      Messages:
      8,360
      Likes Received:
      1
      Trophy Points:
      0
      City, State:
      Trenton, MI
      Year and Model:
      98 ExSport, '00 F-150
      So, what makes you think that the sensor itself is bad? Could it not be just a simple vacuum leak in a PCV hose? A $10 hose sounds like a better deal than a $90 O2 sensor that may not fix the problem...

      The code does not indicate that the sensor itself is bad. The code simply indicates a lean condition being detected by that sensor. It could, in fact, be correct. (I know, it's a novel idea) Until you've done a complete diagnostic, there's no sense in throwing parts at it...

      -Joe
       
    6. wyochimneysweep

      wyochimneysweep Active Member

      Joined:
      August 13, 2007
      Messages:
      200
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      fargo, nd
      Year and Model:
      97 explorer AWD 5.0
      most of the time if its a vaccum leak both sensors willshow lean
       
    7. gijoecam

      gijoecam Village Idiot Elite Explorer

      Joined:
      May 31, 1999
      Messages:
      8,360
      Likes Received:
      1
      Trophy Points:
      0
      City, State:
      Trenton, MI
      Year and Model:
      98 ExSport, '00 F-150
      Depends on where the vacuum leak occurs... With the split intake on the SOHC motor, and two vacuum lines attached to it, it's possible for the vacuum leak to only affect one bank...

      edit: Or, if it's the lower intake manifold gaskets, it can depend on which side(s) is(are) leaking... Vacuum leaks don't necessarily affect ALL cylinders equally...
       
      Last edited: February 17, 2009
    8. CDW6212R

      CDW6212R Elite Explorer

      Joined:
      June 17, 2004
      Messages:
      14,398
      Media:
      3
      Albums:
      1
      Likes Received:
      26
      Trophy Points:
      68
      City, State:
      Knoxville, TN
      Year and Model:
      98 Mountaineer AWD
      The code definition that I read pointed at the one sensor, and the wiring for it. I don't know how many different definition sources there are. I knew I had no more obvious problems, and the wiring, connections were good. Do check those, as well as the obvious vacuum leak sources, tune up items etc. I decided based on mileage and the definition that it was a good time for me to swap the RF sensor. I had it for my 302, it's the same sensor.
       
    9. desertbum8

      desertbum8 Member

      Joined:
      January 31, 2009
      Messages:
      61
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Oceanside, CA
      Year and Model:
      '97 XLT
      Hey guys. I have had the P1131 and P1152 codes show up on my truck. The truck runs great after it has warmed up, but it still has a rough idle. When the engine is cold it has a really rough idle and the acceleration hesitates and sounds like the engine is misfiring. I just replaced the DPFE sensor and it helped a little. I was thinking my bad Cats messed up an O2 sensor. Does anyone have any ideas on how to check my sensors to see if they are bad? Thanks!
       

    Share This Page









    We Support Our Troops!