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  1. #1
    John M's Avatar
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    1995 3.4 O2 sensor replacement

    I need to replace the top sensor, the one behind the motor. I can see it but not sure on how to get at the thing. Removing the dog bone I might be able to get one hand on it. Garage on the corner wants $65 to do it. My time or let the shop have it...?
    1995 Cutlass Supreme Convertible
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  2. #2
    Forum Moderator GOT2B GM's Avatar
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    Pulling the intake plenum makes it reasonable, but for $65, you can't go wrong if you are thinking you might have trouble with it.
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  3. #3
    RobertISaar's Avatar
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    yeah, with the plenum off, it's significantly easier to get at.

    assuming you trust the shop not to break/hide things, $65 isn't too bad.
    Baron of 6811
    1995 Monte Carlo LS 3100, 4T60E... for now, future plans include driving it until the wheels fall off!



  4. #4
    John M's Avatar
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    Is it possible to tip/tilt this motor? I tried on a '92 ,but was unable to move it.
    1995 Cutlass Supreme Convertible
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    Community Manager White93z34's Avatar
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    I've done it by removing the airbox and reaching around the back of the engine before with a crows foot o2 sensor wrench. Pain but I'd do it that way before removing the plenum.
    -Chris D. - Your Community Manager

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    Galaxie500XL's Avatar
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    My understanding is that you shouldn't tip the 3.4. The engine mounts are different than the ones used on the 2.8/3.1.

    Others here should be able to confirm/deny that.

    I replaced my O2 sensor while the plenum was already removed for a timing belt replacement. Since the service interval for the belt is 50,000 miles, I intend to replace it again when the belt needs its' next replacement.

    Quote Originally Posted by John M View Post
    Is it possible to tip/tilt this motor? I tried on a '92 ,but was unable to move it.

    1995 Cutlass DOHC Convertible
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  7. #7
    John M's Avatar
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    After studying the car I could only see 3 ways to change the O2. 1 remove the EGR valve and some hoses, 2 remove a section of exhaust pipe, 3 go to the shop and pay $65. I am going with option 3.
    1995 Cutlass Supreme Convertible
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