incorrect speedo reading. - BMW Forum

oomidire · 06-07-2008, 04:17 PM

Hi Guys,
just noticed the the reading on my speedo is incorrect. I've recently the I get three different speed reading from my speedo, on board computer and my navman satnav. Any help would be greatly appreciated.

darkhorse737 · 06-07-2008, 05:41 PM

what year... what model... what type tires u got? change of tires away from specs will alter your speedo

Bimmer M.D. · 06-07-2008, 11:22 PM

That is actually very common. The navigation is going to be the correct one, because it gets its reading from a satellite. You can have the OBC and the speedometer corrected by a professional; however it may come to be a headache and not worth it.

Since you have a navigation, you are much better off. Just follow that. The problem is know to be an issue right out of the factory; and when different sized wheels are added it only complicated the problem. The nav will always be correct due to the nature of how it measures it.