Code reads P0720-faulty speed sensor

FILTERPETER

MEMBER
2003 FORD TAURUS

I just bought this car at an auction. The check engine light is on, code reads P0720-faulty speed sensor. The speedometer is not working and every once in a while it will not shift into second gear. Do I replace the speed sensor and if so, where is it located? The transmission is an AX-49 per our local Ford dealer.

1 Reply

MERLIN2021

MECHANIC
17,250 POSTS

With this code, you can test the harness from the sensor to the PCM with a voltmeter, if OHM's are five ohms or lees the wire is okay check like this:

This second one is PCM connector Is at the right rear of the engine compartment, mounted thru firewall. Heres the removal process. OUTPUT SHAFT SPEED (OSS) SENSOR Removal and Installation 1. Disconnect the battery ground cable. For additional information, refer to BATTERY, MOUNTING AND CABLES . 2. Disconnect the output shaft speed (OSS) sensor connector. Fig. 217: Disconnecting Output Shaft Speed Sensor Connector Courtesy of FORD MOTOR CO. 3. Remove the output shaft speed (OSS) sensor cover. 1. Remove the connector. 2. Remove the bolt. 3. Remove the cover. Fig. 218: Removing Output Shaft Speed Sensor Cover Courtesy of FORD MOTOR CO. 4. Remove the output shaft speed (OSS) sensor. Fig. 219: Removing Output Shaft Speed Sensor Courtesy of FORD MOTOR CO. NOTE: Lubricate the OSS O-ring before installing the sensor.