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new O2 sensors for better gas mileage? V70-XC70 1998

posted by  RedAlrt on  Sat Jun 24 10:53 CST 2006
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last visit: Thu Apr 26 12:11 CST 2012
[RELATED]

The sensor manufacturers say that if you replace your "worn out" O2 sensors, you can increase your gas mileage by X %

Have any of you replaced your O2 sensors as preventive maintenance resulting in better gas mileage?








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    new O2 sensors for better gas mileage? V70-XC70 1998

    posted by  someone claiming to be ksg on  Sun Jun 25 05:11 CST 2006 [RELATED]

    Read up on technical info on oxygen sensors and how they work. Bosch website has good info. The heated ones can become sluggish when dirty, but otherwise they either work properly or don't work at all. The sensor is part of a feedback control system that regulates the mixture. Like other feedback systems they keep pretty close tolerances (in this case mandated by federal government). When the oxygen sensor fails completely and produces no signal at all or an extreme value unrelated to oxygen, then the gas mileage and emissions will go very bad and you will get your 'check engine' light. It makes no sense to prematurely replace one.








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    new O2 sensors for better gas mileage? V70-XC70 1998

    posted by  someone claiming to be deweywho on  Sat Jun 24 12:21 CST 2006 [RELATED]



    Volvo says change at 100K but they can go much longer. I ran a Ford Windstar (I hate to admit it but we needed it for a wheelchair lift) with the origionals for 170K w/o a sign of a problem. Ran fine and fuel milage never varied. They tend to fail slowly anyway








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      new O2 sensors for better gas mileage? V70-XC70 1998

      posted by  MadeInJapan on  Sat Jun 24 16:14 CST 2006
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      last visit: Sat Oct 2 06:34 CST 2010
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      True, they do last longer. I took a front 02 sensor into my indy for him to change it out. My car now has 122K miles on it. He told me that he checked the voltage resistance and that my 02 sensor was acting as if it were brand new and there was no reason to change it...that he would change it once I got a code for it. He also told me that the one in there looked brand new. I bought this car a bit over 30K miles ago...don't know if the previous owner changed it out or not. Anyway, my 2cents is to change it if it's needed and not before.
      --
      1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.








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    new O2 sensors for better gas mileage? V70-XC70 1998

    posted by  KlausC on  Sat Jun 24 11:01 CST 2006
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    last visit: Fri Oct 24 10:15 CST 2014
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    At $170 each, that is a lot of gas. Plus a good wrench and time to do it right. It is probably better to check the O2 sensor for the correct resistance than to arbitrarily replacing it.

    Klaus
    --
    (V♂LV♂s 1995 854T, 1998 V70R)







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