Question about Volvo S80

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I have a 2000 Volvo s80. I bought 4 used tires and had to upgrade to 225/60/16(from a 225/55/16) tires because that was the only tires the dealership had used (I wanted 4 cheap tires). As soon as I picked the car up and drove off the lot and started to accelerate the tire slipping light came on in my dash, this is the STC warning light, and I was pushing the accelerator and the car was not accelerating. The past couple days this has been occasionally happening when I am going about 20-30 mph. This does not happen all the time usually just within the first 10 minutes of driving, then it will not happen again. When it does happen the RPM's do not rev up like the car is in neutral when the gas is pushed, the RPM's stay normal and I just coast until the tires start accelerating again when the gas is pushed. It is kind of like the gas pedal has been disabled because of some warning going off in the computer. I usually let of the gas and wait for the STC warning light to stop blinking and then try to accelerate. Any thoughts what this could be? Is this a speed sensor malfunction?

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  • charles_weit Nov 08, 2010

    I have tried to research where this speed sensor is but have not found any information on it. I am sure I have to remove the wheel to find this correct? If I remove the wheel will I find a sensor connected somewhere around the wheel? Where is this sensor and wiring? Are there sensors on both wheels? Thanks

  • charles_weit Nov 08, 2010

    I have tried to research where this speed sensor is but have not found
    any information on it. I am sure I have to remove the wheel to find this
    correct? If I remove the wheel will I find a sensor connected somewhere
    around the wheel? Where is this sensor and wiring? Are there sensors on
    both wheels? Thanks

  • charles_weit Nov 08, 2010

    Thanks for the help

  • charles_weit Nov 08, 2010

    Ok, I have an code scanner for the car. I may see if that picks up anything. Could one of the sensors have a lose connection?

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  • Master
  • 1,450 Answers

Yes you most likely have a speed sensor issue probably from one of the wheel speed sensors check wiring and connections at wheels

Posted on Nov 08, 2010

  • TripleTauto
    TripleTauto Nov 08, 2010

    you have a wheel speed sensor at each wheel.the only real way to see what is going on is to have a scan tool on vehicle and monitor the speed sensors and see if one is dropping out,causing the traction to activate. you woill most likely have to take the wheels off to see sensors or have on a lift.

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