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speedo reading low

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Old 05-02-2012, 06:57 PM   #1
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Default speedo reading low

my speedo has been reading low for a while, about 10-15 mph. any idea how i could fix this or cost involved?
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Old 05-03-2012, 02:54 AM   #2
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Has your rear end been changed?
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Old 05-03-2012, 06:43 AM   #3
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Depending on the cause, the fix will be different.

In addition to the rear end, are your tires the stock size and/or have you changed the gauge face?
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Old 05-03-2012, 09:18 AM   #4
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i personally havent made any changes, but the previous owner could have.
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Old 05-04-2012, 06:55 AM   #5
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OK... Are the gauge face, tires, and rear end stock?
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Old 05-04-2012, 06:59 AM   #6
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yes everything is stock as far as i know. could be some aftermarket gears in there but i have no idea.
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Old 05-04-2012, 07:39 AM   #7
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the faster you go, the more it's off?
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Old 05-04-2012, 07:54 AM   #8
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Also a4 or six speed?
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Old 05-04-2012, 09:29 AM   #9
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hard to tell if its off the faster i go, seems like it. its a m6.
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Old 05-04-2012, 02:31 PM   #10
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I think someone swapped gears
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Old 05-05-2012, 06:35 PM   #11
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Quote:
Originally Posted by Karl101 View Post
I think someone swapped gears
if the stock gears are 3.42, and its reading low, do you think they went higher (3.73, 3.90) or lower? (3.23,2.73)
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Old 05-06-2012, 08:26 AM   #12
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Do you have a portable GPS? They will have a very accurate speed rating on straight roads.

If you use the GPS, you can confirm if the speed off more the faster you go. If so, you can calculate what you have. If not, you can use the GPS to fix your gauge.
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Old 05-06-2012, 08:54 AM   #13
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i do have a gps so i can try that. but how would i fix it on my own? isnt it something that needs to be tuned?
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Old 05-07-2012, 06:45 AM   #14
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If its a gear problem, yes. But you should confirm the problem with the GPS first. For a gauge face fix, its as easy as repositioning the needle on the face. (If the difference is constant at any speed.
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