Mechanics

SPEED SENSOR

2003 Ford Taurus

Transmission problem
2003 Ford Taurus 6 cyl Two Wheel Drive Automatic 106000 miles

I just bought a Ford Taurus in an auction, the check engine light is on, code reads P0420-Faulty speed sensor. The speedometer is not working and every once in a while it won't shift into 2nd gear.
Do I replace the speed sensor and if so, where is it located. The tranny is an AX-49 per our local Ford dealer.
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Filterpeter
February 1, 2010.



You probably wood, but the cluster could be NG too, you might want to re-scan the codes, P0420 is NOT a VSS code! Get and post the right code please!


http://www.2carpros.com/forum/automotive_pictures/62217_P0420_1.gif


The tranny is probably an AX4N?

Merlin2021
Feb 1, 2010.
My mistook. It was P0720 not 0420.

Tiny
Filterpeter
Feb 1, 2010.
OK thanks, let me have a look at it.

Merlin2021
Feb 1, 2010.
With this code, you can test the harness from the sensor to the PCM with a voltmeter, if OHMs are 5 ohms or lees the wire is OK check like this:


http://www.2carpros.com/forum/automotive_pictures/62217_oss_2.jpg


http://www.2carpros.com/forum/automotive_pictures/62217_Ford_PCM_104_Conn_1.jpg

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.


http://www.2carpros.com/forum/automotive_pictures/62217_ossa_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_ossb_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_ossc_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_ossd_1.jpg


Merlin2021
Feb 1, 2010.