Speedo and flashing OD light? Related? - Ford Powerstroke Diesel Forum
 
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post #1 of 5 Old 03-14-2010, 02:01 PM Thread Starter
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Speedo and flashing OD light? Related?

My 99 f-250 superduty 7.3 OD light is blinking and the Speedometer does not start working until about 20mph? Could these be related?

What should I have scanned the PCM or the GEM?

HELP.

Thanks
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post #2 of 5 Old 03-14-2010, 08:24 PM
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Probably rear differential speed sensor, same thing happened to me last summer. Part is around $20 at Napa or Ford.

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post #3 of 5 Old 03-15-2010, 05:13 AM Thread Starter
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Rear diff speed sensor? Where is it at? I just replaced the ABS sensor and I do not remember another on the rear diff? I will look again. Thanks.
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post #4 of 5 Old 03-15-2010, 05:30 AM
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It's on top of the rear end... same thing happen to me last week...
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post #5 of 5 Old 03-15-2010, 06:05 AM
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Quote:
Originally Posted by tdnp View Post
Rear diff speed sensor? Where is it at? I just replaced the ABS sensor and I do not remember another on the rear diff? I will look again. Thanks.
That is it. check conection makesure the weather pack is there.

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