Question about 1991 Volvo 740

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Speedometer/Odometer Failure I'm guessing that this is the result of a bad speed sensor on the rear diff.; but if that is the case - I thought that the odometer would still function. I was wondering what else I should look for to troubleshoot the problem further before dropping $150 on a new unit.

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  • Alderfin Jun 17, 2008

    Thanks for confirming -

  • Brian Muller
    Brian Muller Jun 30, 2008

    I have a speedometer/odometer that don't work as well. How do I know if it is due to the sensor or the board on the dash unit?
    My car is a 1990 740 Turbo so it has the Japanese circuit board on the dash unit.

  • Brian Muller
    Brian Muller May 11, 2010

    Thanks, I will check that. I am curious though, when your speedometer cut out did it go gradually, bouncing the needle whenever you hit a bump?

    Also, I'm not sure where my garage manual is, as I just finished moving, but I do not know where the sensor is.



3 Answers

Try checking the wiring where it enters the sensor; my speedo needle "bounced" occasionally for a while before it quit completely, and at times worked for a bit when driving in the rain. On inspection, the aforementioned wires had rotted due to age and just needed some tlc (aka cut back and reattached).

Posted on Jul 09, 2008

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I have had the same problem in my volvo. i didnt have to replace the sencor it was just a bronken wire, and from what i have read a broken wire is more like then a bad sensor. to see if that is the case just jack up the back of ur car, and look at the sensor there r 2 wire. if they r not connected then there is ur problem.

Posted on Jul 01, 2008

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If your speed sensor is not working ,thats mean your odometer is not gonna work.try to take off your sensor and spin it ,while somebody looking at it,it suppose to move when you spin it,usually if the odometer stop working you gonna need a new/used one,

Posted on Jun 17, 2008

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2003 Grand Marquis digital speedo only reads "0". All other displays read correctly. Could it be the speed control? If so, where exactly is it located?

The speedometer provides speed information based on a speed/distance pulse signal from the vehicle speed sensor (VSS). The VSS is mounted on the speedometer driven gear in the transmission.
or the gauge is bad .
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