Craig Danczyk
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• Vicksburg, MS, USA |
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• Registered on 11/29/2003 |
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• 11 posts |
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 Posted:2/21/2004 08:46 |
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What is the Output Speed Sensor, OBDII Code P0720 on a 2000 Ford Excursion 6.8L 4x4? I was driving on I-20 last night, and my Overdrive button 'OFF' light started blinking while at 75 mph. Normally the OD button is either ON (no light), or OFF (Off light illuminated). Shortly afterwards the check engine light came on, and Auto Zone read the code to be P0720 'Output Speed Sensor'. I took out the OD button on the shifter and wiped the pins and put it back in. It has not done it since, but I have not driven far. What is going on with the X, and how do I fix it! Your Help is Greatly Appreciated! |
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monsta
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• The Big Island, HI, USA |
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• Registered on 1/5/2002 |
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• 1,048 posts |
• 2
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Posted:2/21/2004 14:59 |
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The Output Speed Sensor is located on the top of the rear diff. I think they go for about $20.00. 
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trauski
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• indianapolis, IN, USA |
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• Registered on 3/10/2003 |
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• 44 posts |
• 1
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Posted:2/23/2004 10:10 |
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had the same happen to my 2000 4x4 v10 x. it started flashing just like yours. took to dealer and when they pulled out speed sensor it had metal shavings all over it. they put in new sensor and still had problems so replaced bearings as that is what was causing the metal shavings. covered under extended warr had about 40,000 miles at time. make sure auto zone doesnt clear codes when you take it in as the dealer gave me a bunch of %*&$ the last time i took it in. they said when they scanned it they showed that the codes had been cleared. there is code for clearing codes. i might have had it scanned at autozone a while back just for the heck of it since not all codes set off check engine light with ford. i just told them kids left light on in back and battery went dead. they said that wwould cause it , but i dont think they where convinced. good luck, might be 1200 big ones if you need bearings. |
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Craig Danczyk
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• Vicksburg, MS, USA |
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• Registered on 11/29/2003 |
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• 11 posts |
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Posted:2/23/2004 13:40 |
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Thanks for all the help guys! I replaced the speed output sensor on the differential today, and Ken was right (about $20). I noticed my sensor had some shavings on it, but It was not a lot. I was hoping that is from 45,484 miles of normal driving. I do not have an extended warranty on my vehicle. I thought about changing the oil in the rear end too, but I checked it and it looked clean. Any more good information is GREATLY APPRECIATED! |
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dnevins
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• Subscriber since 12/29/2009 |
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• San Diego, CA, USA |
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• Registered on 12/28/2009 |
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• 340 posts |
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Worth adding for the next V10 owner who sees that blinking light: when the O/D OFF light flashes instead of staying on, the computer is telling you it has logged a transmission related fault. It is not a switch problem, so cleaning the button pins won't fix the cause.
P0720 names the output shaft speed sensor, and on the 4R100 automatic that sensor is on the transmission case itself, toward the rear (check a manual for the exact spot on your year). The sensor on top of the rear differential is a different one that feeds the ABS and the speedometer. Both can cause speed related trouble, so start with the one the code names: unplug it, look for corrosion in the plug, pull it and check the magnetic tip for metal fuzz, and look at the wiring where it runs along the transmission. If the tip is covered in metal, the reply above about worn bearings is the thing to chase.
Dana
https://partslogic.com |
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