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1983 - 2012 Ranger & B-Series All Ford Ranger and Mazda B-Series models

Speedometer reading 10mph faster?

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Old Nov 10, 2006 | 11:40 AM
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4x4MUDSLINGER's Avatar
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Speedometer reading 10mph faster?

99 Ford Ranger Supercab 4x4 auto 4.0L loaded

Codes: C1145 and C1234

I am told the C1234 was the rear dif sensor and the C1145 is the dash cluster pod.

Dash cluster pod also has factory tach.

Replaced the rear dif sensor but stopped at changing out the dash cluster pod.

Any suggestions or a way of checking if their dx is correct?
 
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Old Nov 10, 2006 | 09:33 PM
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C1145 = RF speed sensor malfunction?

Do you have four wheel ABS or rear wheel abs?

As far as the speedo being off.. does it have stock rear end? stock tire sizes? You can have the speedo reprogrammed with ford scan equipment by putting in the gear ratios and tire size..

good luck
 
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Old Nov 11, 2006 | 06:08 AM
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stock rear, stock tire size. speedo use to work properly. To my knowledge truck has 4whee ABS. Will have to verify. Curious why Ford Dealership did not mention reprogramming of speedo ...?

Thanks
 
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Old Nov 11, 2006 | 05:44 PM
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I'm not 100% positive you can on a 99. Mine is a 2000 and I reprogrammed it myself (when I worked at a Ford dealer) when I upped my tire size from 225/70R15 to 235/75R15 so my speedo would stay accurate.

They might have tried to reprogram it, and some internal software failure (of the cluster/module) might have caused some kind of error... OR maybe you got the part-time guy who doesn't really know what he's doing

Did they explain WHY they want to replace the cluster?
 
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Old Nov 11, 2006 | 06:06 PM
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They only indicated the two codes, one being the rear diff sensor which they replaced. I was told they tested it and it still did not register the correct speed. The next thing they wanted was to replace speedo (2nd code) but the truck had to sit while they had a new one set to the same mileage as the current odometer. I could not have the truck down for a week. I felt at this point they were guessing and it was costing too much.
 
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Old Nov 11, 2006 | 08:36 PM
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Both the 86 that I had from brand new and my 2000 I got this year were off by 5 MPH. The 86 was stock and as far as I can tell the 00 hasn't had any changes. Helps keep me from speeding too much.
 
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Old Nov 12, 2006 | 11:41 AM
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Thanks ValkyrieVixen...if the speedo from you 86 was off when brand spank"n new...did you have it fixed while under warranty? What was the reason for discrepancy? 5 mph is acceptable...this puppy is from 10 -15 depending on the vehicle speed. Not a problem on the open highway, just go with the flow of traffic. A major concern is the odometer is adding more mileage to the truck that what it actually has driven.
 
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Old Nov 12, 2006 | 01:00 PM
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It was never a big enough deal to bother with, just left it that way.
Yours sounds like more of a pain and probably computer related.
Sorry I couldn't be of more help.
 
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Old Nov 12, 2006 | 01:19 PM
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I believe your correct on both counts... a pain and computer related. I am glad that my other truck, a 1987 V-2500 HD, Sierra Classic GMC 4x4, 33-12.5x15.5 BFGoodrich Mudders, TBI 350, PT 3:53, 4-speed Muncy w/creeper, SS 3" dual Flowmaster 50's has a mechanic speedo. thanks for replying...
 
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