Question about 1999 Ford Taurus

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Replacing a vss

I believe the vss has gone bad in my 1999 ford taurus. How would i proceed to check that is the problem, and where would it be located to replace it? thank you

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The VSS is on the transaxle case, it is a pickup coil (variable-reluctance) sensor. To check it, you will need a wiring diagram to identify the functions of connector terminals.

Check:
Disconnect the VSS connector and turn the ignition On, but do not start the engine. Using a multimeter, check for voltage between the sensor connector and ground as shown on the diagram. It should have 1.5 volts on one of the sensor wires with the key on and the engine off.

Remove the VSS from the vehicle.

Raise the vehicle and support it on jackstands, disconnect the electrical connector from the VSS. Remove the hold-down bolt and clamp, then remove the VSS from the transaxle

Connect your multimeter to the VSS, and set teh meter to the AC scale. Check for voltage pulses as you spin the sensor drive gear. If there is no pulsing signal from the voltage, replace the sensor.

When re-installing the old, or installing a new, make sure to inspect the O-ring on the sensor. Replace it if damaged, or if you are installing a new sensor, use a new O-ring.

Don't skimp in reusing the O-ring. They're not expensive and it'll save you a lot of headache if the O-ring breaks or damages due to using the old one.

I don't see a price listed on Autozone's website, but make sure you know whether your transaxle has a 17 or 19 bolt fluid pan. They'll need to know so that you can get the right sensor. They range from $29.99 to $111.99 at the Kragen/Oriely website. This is for the OHV 3.0L Vulcan engine (removal, installation, and check procedure is the same regardless of engine type).

Posted on Jun 24, 2009

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Hi there:
On 1999 Ford Taurus 3.0L EFI 6cyl the Vehicle Speed Sensor is Mounted on transmission. To removal procedure...


  1. Disconnect the negative battery cable.
  2. Raise and support the vehicle.
  3. Remove the catalytic converter Y-pipe.
  4. Unplug the VSS electrical connector.
  5. Remove the VSS protective heat shield.
  6. Remove the retaining bolt from the VSS.
  7. Lift the VSS out of the transaxle.
  8. Remove the driven gear retainer and the drive gear.

To install:
  1. Inspect the O-ring on the sensor and replace if necessary.
  2. Install the driven gear and the retainer.
  3. Place the VSS into the transaxle.
  4. Tighten the retaining bolt to 36-53 inch lbs. (4-6 Nm).
  5. Install the VSS protective heat shield.
  6. Attach the VSS electrical connector.
  7. Install the catalytic converter Y-pipe.
  8. Lower the vehicle.
  9. Connect the negative battery cable.



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