The vehicle speed sensor,(VSS). is a device sensor/mounted somewhere on the
transmission that signals the transmission when to shift based on
transmission shaft spindle speed. The transmission shaft spindle speed is
also used to calculate the
vehicle speed depending on which gear the transmission is in. It is driven
by a geared wheel off the transmission, which sends a signal to the Power
Control Module, PCM. When it does not work, due to a bad sensor or the wires
broken, you get poor shifting or none at all, and of course no vehicle speed
indicator on the speedometer.
It is not a difficult repair. The hardest part for me was locating and
reaching the sensor.
On the 97 Taurus with a 3.0-V6 Vulcan, VSS is located on top of the
Transmission, (passenger side.) in that space between the transmission and
the exhaust manifold.(firewall side). It is near impossible to reach from
inside the engine compartment without removing a lot of stuff, but not
Go to the parts store, asked to see what a VSS looks like.( it has a
distinct shape.) Once you have an idea what you are looking for, the job
become a bit easier.
Any competent shop with the right code reader, or scanner should be able to
fix it. Have the shop run a diagnostic to get the error codes. The codes
will narrow it down, if not pinpoint the exact problem.
** A thousand sensors, going bad left and right..! We deserve better
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