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Discussion Starter #1
Hi please can anyone help me my speedo is out by 10mph over how are we're does it get readings from?
 

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Super fantastic Mod Technical Supremo Nice Guy
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Check correct wheel size is fitted and someone has not changed them
Needs to be modified in the UCH , if llarger or smaller wheels fitted..
 

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Should be on one of the following tyre sizes

Tyre Size / Rim Size / PCD / Pressure (Bar front/rear)
195/65R156.5Jx15 ET454x1002.2 / 2
195/65HR156.5Jx15 ET454x1002.2 / 2
205/55HR166.5Jx16 ET494x1002.2 / 2
205/50VR176.5Jx17 ET494x1002.4 / 2
 

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Discussion Starter #5
Hi thank you all for replying I have 205x55x16 so how were does the speedo get its reading from is there a sensor?
 

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Super fantastic Mod Technical Supremo Nice Guy
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That's if these are The original size when the car was built and no one has changed them,,,, or the clocks, or had the clocks apart..
If unlnown on any of the above, then you need to check in the UCH . first


ABS computer/module works out the vehicle speed for what tyre size has been programmed into the UCH
You could strip the clocks, and move and refit the needle to match the desired speed..
 

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Discussion Starter #7
Thanks for your reply back that's a bit over my head just Fort that it mite be a sensor.
 

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Super fantastic Mod Technical Supremo Nice Guy
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39,821 Posts
These Meganes tend to have ECU kits replaced.
When this happens you could find its come off an estate car, where bigger wheels were fitted just wants the UCH adjusting to what size you have on now
If you know someone with a decent diagnostics interface that can adjust the settings, then you can check the UCH
OR
If you have a laptop, and want to do it yourself, invest in a Renault-COM
bluetotth, Less than £30 at the moment on tbay
 

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Hi

how do you know your spedo is out ? and in what direction ?

Incidentally my old 2006 Mk II 1.5 dci ST (estate) had the 205/55 16 fitted.

Al
 
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