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2000 XC V70 slight transmission noise V70-XC70 2000

We've noticed a slight noise coming from the transmission when it's either in Drive or Reverse. If it's on neutral, there's no noise and very quiet. Any ideas what might be causing that?

Also on a different question, we took Volvo into Volvo Dealership for inspection and were told that cat converter was bad and that it was triggering "check engine" light inside cabin. I've read in a few forums that the O2 sensors usually are the ones that go bad instead of cat converter. Help! I looked at pricing online for O2 sensors and seems they run approx 190 for front and rear O2 sensors. Are there alternatives out there?








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    2000 XC V70 slight transmission noise V70-XC70 2000

    The bevel gear is similar to the transfer gear in 4wd trucks, except the bevel gear is always engaged. It sends the power to the rear driveshaft. The bevel gear fluid needs to be replaced every 50K miles, less if you make use of the awd system a lot - live in snow/ice climate or on dirt roads.
    There is a procedure that involves drilling a hole in the bevel gear case to allow the fluid to drain so it can be easily flushed. The write up is over on Volvospeed.com, do a search there.

    On the other topic. You blindly took your car to a dealer and believe him? Did he tell you the code number? It should be on the written report.

    You have an 8 year old car, the elbows on the vacuum lines entering the intake manifold could be cracking and letting in unmetered air. This will cause the ECU to run rich and the front O2 sensor gets confused and sets a code because it can not react fast enough to the changing fuel conditions.
    Or, you really do have a failing O2 sensor. In that case, replace the front O2 sensor. The rear sensor usually lasts longer than the front.

    When the O2 sensor has failed for a long time, a second code is generated warning of possible damage to the cat converter. This is just a warning, but the dealer can tell you that the cat is damaged and point to the message. Seldom does the cat fail unless the engine gets neglected for a very long time.

    Klaus
    --
    Volvoless. Sold the R. There is now a void...








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      2000 XC V70 slight transmission noise V70-XC70 2000

      Thank you Klaus.....I know I made that mistake of taking it in to a dealership and after searching high and low, found this website....thank God!

      I will certainly look at what you've described and replace vacuum lines and O2 sensor as they are alot cheaper than shelling out $2600.00 for tranny.....sure would be nice if you were in Denver! Thanks again and take care.

      ps. You wouldn't by chance know someone in the Denver area that can help with drilling a hold in bevel gear case...would you?








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        2000 XC V70 slight transmission noise V70-XC70 2000

        Take a look at this:

        http://volvospeed.com/Repair/AWD_bevelgear_diff_service.html

        Then look at the "shops" in the pull down menu at the top of this screen and look for what is in denver. A lot warmer there than here.

        Klaus
        --
        Volvoless. Sold the R. There is now a void...








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          2000 XC V70 slight transmission noise V70-XC70 2000

          Right on! Appreciate replu.

          Where are you at? We are having some unusual weather past few days. High 60's if you can believe that! I actually have another T5R that I've been working on trying to get it back on the road.

          Thanks again for replies!








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            2000 XC V70 slight transmission noise V70-XC70 2000

            Minnesota, but my parents are in colorado springs which has a terrible Volvo dealer.

            Klaus
            --
            Volvoless. Sold the R. There is now a void...







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