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Automatic Transmission Input and Output Speed Sensor Replacement


After an OBD II scan you learn that your input or output speed sensor has malfunctioned and needs to be replaced.  You can take your car to the repair shop or dealership and spend between $100 and $250 or more to have one speed sensor replaced or you can replace the sensor yourself for a fraction of the cost. 

The DIY cost for replacing a speed senor is the cost of the sensor.  Depending on the vehicle year, make and model, a speed sensor can cost as little as $7.92 or as much as $100.  For most vehicles, the average cost of a speed sensor sensor is between $25 and $45.   

Speed Sensor Replacement

Follow these instructions to replace a faulty transmission speed sensor:  The same removal and installation instructions apply for both the input and output speed sensor.

CAUTION: When installing the new speed sensor be sure the O-ring on the new sensor is correctly fitted on the sensor before installation. 

NOTE: Although a input and output speed sensor look very similar - they are not interchangeable.

Speed Sensor Replacement Procedures Begin Here

Removal of faulty sensor

1 Loosen and remove the negative battery cable.

1 Locate the faulty speed sensor and disconnect the speed sensor electrical connector.

Transmission speed sensor

Note: On older vehicles and vehicles driven in harsh weather, be especially careful when disconnecting the plastic electrical connector from the sensor as they break/crack quite easily.

1 Unscrew and remove the sensor.

1 Check the electrical connector wiring to insure there are no breaks orSpeed sensor connector exposed wires.  It is best to replace a cracked or broken connector but it is usually not necessary as long as the connector fits tightly onto the sensor.  Use electrical tape to repair any exposed wires. 

Installation of new sensor

1 Verify O-ring is installed on new sensor.

1 Install and tighten new sensor.  CAUTION: These sensors are plastic and can break if over-tightened.

1 Connect speed sensor electrical connector.

1 Connect and tighten negative battery cable.

After replacing the speed sensor, the Diagnostic Trouble Code that caused the check engine light to illuminate should clear itself, which will turn the check engine light off.  If the check engine light does not turn off, have the computer scanned again to see if there is a different code set.



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