Question about 1998 Ford Taurus

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Transmission o/d light flashes and does not shift properly

1998 Merc. Sable, 24Valve motor. At hiway speeds the o/d light flashes and does not shift into o/d or it flashes and the speedo does not responds(goes to 0). I know the car is in o/d when this occurs because I can down shift with the o/d cancel button and the rmps goes up. But on other occasions the rpm goes up and the cancel button has not been touched, rpms are running high. I had the tranny flushed and filled last year, about 10 000kms ago. Garage has had a quick look and said the fluid is already a bit brown. Car has 118 000kms and had been flushed and filled and filter changed at about 50 000kms and 108 000kms. Hope this is enough to go on.
Is this a electrical or mechanical problem? What is the solution?

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Sounds like u have a bad vss (speed sensor ) its located on the transmission have some one drive the car with a scan tool and check the speed when it goes to zero the scant tool will also the computer thinks you stopped pretty easy fix located on the output side of the trans passanger side

Posted on Jan 29, 2009


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Posted on Jan 02, 2017


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yes, it's the speed sensor. It is mounted in the transmission above the axle as seen in picture below. The part is $24 at Before buying the part, make sure the connector is properly attached to the sensor and the wiring is intact. If the wiring is good, the sensor is most likely the problem. let me know if you have any more questions.


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98 mercury sable

Check the transmission fluid first. it sounds like one of the clutch plates is sticking.

If you shift into second after you've stopped, can you get the car moving?

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