Having problems with your 1999 Mercury Sable ?

99 Mercury sable speedo/tranny

\015 When Iam driving along all the sudden the speedometer will just go to 0 it still goes, but occasionally it won't shift out of first and it shifts hard when it does....\015 Posted / edited by AnonymousUser on : 19-02-2018

Answers :

VSS (vehicle speed sensor) Tells the PCM (computer) the speed of the vehicle so the PCM can make the proper information to the TCM (transmission control module) to shift.
\015\012YOU are goin gto need a scan tool NOt a code reader to monitor the VSS to see what it is putting out for speed when the car is moving But I believe you need a VSS but do not not Go out and buy one until you have had it tested , and can positively confrim it is bad first. Please rate this a fixya if you find this advice helpful, Thanks Randy
 When the car goes to 0, does the speedometer go back to its original position? Does the car shut off when this problem occurs, is there loss of power? Any abnormal shakes, smells? Does it only shift hard or not at all when the speedometer does go to 0 or is this all the time. Is the check engine light, transmission light or any dash lights on "while driving"? Trying to get a better understanding of what is going on. The more information you can provide the better. 
Repair Help & Product Troubleshooting for 1999 Mercury Sable

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