Replacing Rear Heated O2 Sensor

Discussion in 'General Motoring' started by HyperCube33 \(Life2Death\), Mar 19, 2007.

  1. I did more research and found that I replaced the wrong sensor (someone told
    me the code meant the front one, doh!) so I had the rear heated o2 sensor
    ordered and will pick it up today. I've read that its a pain to get off, but
    that's fine. I'm not exactly sure where it is since I haven't been able to
    get under there and look, but I do know its around the cat converter (after
    it, no?)

    I've also read that you need a special tool or socket or something to get it
    off. Is this even true? The pictures I've seen of the sensor don't seem like
    you'd need more than a wrench. I'm hoping I'm not wrong :p
    HyperCube33 \(Life2Death\), Mar 19, 2007
  2. HyperCube33 \(Life2Death\)

    James1549 Guest

    Yes they make special sockets just for O2 Sensors. But not all require
    the socket if it is in a place you can get to it with a wrench or
    other tool. I would soak down the threads at least a few hours, if not
    overnight to help loosen the sensor.

    James1549, Mar 19, 2007
  3. I've got pictures of where the bastard thing is located. I banged around on
    it with a wrench before giving up and deciding to get better tools. Its
    currently soaking if you will, but its quite welded in there through rust
    and exhaust.
    Later on I'll post pictures to all who care!
    HyperCube33 \(Life2Death\), Mar 20, 2007
  4. HyperCube33 \(Life2Death\)

    Oppie Guest

    I recently replaced the downstream HO2 sensor on my '01 lw300 with 98K on
    it. Expecting quite a struggle, the sensor came out with only an adjustable
    wrench (albeit a 12" one) and quite easily at that. I've had to use a torch
    on other vehicles to soften the rust in order to remove the sensors. This
    was a pleasant surprise. I have the special wrench but given the angles and
    access space, a good 'ol adjustable spanner worked just fine.
    After removing the sensor, you are supposed to chase out the threads on the
    pipe with a tap. I've never had the right threaded tap so just made do.
    Oppie, Mar 20, 2007
  5. Well, not the case in mine. There is a shield blocking any room that an
    adjustable wrench would have. I've been there, tried that. I must also note
    that the reason I suspected the sensor went was because the connection is
    right under where my car blew all of its tranny fluid. Oddly enough, today
    the Service Engine Soon light went off, and my car stopped choking on gas.
    I'm not sure what to do at this point, if I should go ahead and toss the
    sensor in since I have it and will have the car jacked up, or return it and
    get my $75 back. Blah!

    Regardless, I was planning to post a how-to on, with pictures, of
    the whole procedure, and any others that I do. I also would love to put
    together a wiki or something with color photos on how to do many repair
    procedures - with the help from you guys. I know what I've learned so far
    has benefited me, and this is on my first car, and I am grateful that it was
    a Saturn, I now love my car even though it seems like its falling apart!
    (and may be, it looks to me like it was in some kind of drivers side
    accident before I got it, used.)

    Much thanks,
    Brian Thorp
    HyperCube33 \(Life2Death\), Mar 21, 2007
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.