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Transmission Speed Sensor Cost
and Replacement

After an OBD II scan you learn that your input or output vehicle speed sensor (VSS) 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 sensor 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 cost for a speed sensor is between $25 and $45.   

Speed Sensor Replacement

Follow these procedures for replacing a faulty vehicle speed sensor (VSS).  The same removal and installation instructions apply for both the input and output speed sensor.

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

Note: Input and output speed sensors are not interchangeable.

Speed Sensor Replacement Procedures Begin Here

Removal of faulty sensor

1 Loosen and remove negative battery cable.

1 Locate the faulty speed sensor and disconnect the speed sensor 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 connector wiring to insure there are no breaks orSpeed sensor connector exposed wire.  It is best to replace a broken connector but not absolutely necessary as long as the connector fits tightly onto the sensor.  Use electrical tape to repair any exposed wires. 

Installation of new sensor

1Verify O-ring is installed on new sensor.

1Install and tighten new sensor.  CAUTION: These sensors can break easily - do not over-tighten.

1Connect speed sensor electrical connector.

1Connect and tighten negative battery cable.



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