Who has cheap 740 O2 sensor?

Discussion in 'Volvo 740' started by geronimo, Sep 24, 2007.

  1. geronimo

    geronimo Guest

    Its for my 92 740 turbo wagon. After changing the air mass meter, the
    gas mileage went up to normal for a couple of weeks, and then
    plummeted again. Needs another new part. Rock Auto has a Bosch sensor
    for $99. But I seem to remember a few months ago someone in this forum
    told me of a source for one that is only around $ 60. The car is
    setting a code for "adaptive lambda either too rich or too lean at
    part load". It is 3-wire , heated type.
     
    geronimo, Sep 24, 2007
    #1
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  2. geronimo

    John Horner Guest


    There are "universal" sensors sold for around $60 which require splicing
    instead of being a direct plug in. I've not had the best of luck with
    those splices and would spend the extra $40 (about one tank of fuel!) to
    get a direct connect type.
     
    John Horner, Sep 24, 2007
    #2
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  3. geronimo

    geronimo Guest

    Part of my job as an avionics tech is making high-reliablility
    splices, so I have no qualms about tackling automotive splices. Its
    the mechanic stuff I am often not so hot with ;-) Regards, Geronimo.
     
    geronimo, Sep 24, 2007
    #3
  4. Test your lambda first, because the most certain is
    that the problem should be elsewhere.

    You need a multimeter and a gas flame and some instructions
    that you can find in the web, like I did some years ago.
     
    JM Albuquerque, Sep 24, 2007
    #4
  5. geronimo

    geronimo Guest

    Yea, I probably should look at the connector first...its is in
    such a high-heat area, and the car is so old.....still the O2 sensor
    has probably not been changed well in excess of 60K miles, I suspect.
    I was looking at a NTK brand universal replacement. THe salesman on
    the i-net whom I chatted with said it is not a good idea to get a
    universal (no connector) as I will "never get a good enough
    connection, and the reading will be inaccurate". What does teh
    average mechanic do? Crimp a plain butt splice on?
    He may be right...but it depends on how long the wires are a lot,
    the splices will get hot as an oven if the wires are only a few inches
    long! Possibly it would get so hot with the splices near the sensor
    that even a normally high reliability splice like a solder-splice with
    (high-temp fusion wrap) would melt or weaken.
    I can pay $65 for a NTK universal, or for *$100 MORE* get the very
    same thing with a connector! Thats' insane.
     
    geronimo, Sep 24, 2007
    #5
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