Odometer/speedometer off on M7

[dgreet77]

So last year I noticed that my speedo/odometer seemed to be off on my '05 M7. I saw my speedo hit 120 a time or two when I definitely was not doing 120, but still moving right along. Also on a 50 mile ride, according to a couple buddies' odometers, I was reading more like 70 or 80 miles.

The sled was extended from a 141" to a 153" by the previous owner, would this make the speedo/odo be off? Or does the sled need a ECU reflash or something?

Its not really that important to me, and the sled runs very well minus a couple of clutching issues. So its fine except for I'm racking up more miles than I really should be on my Odometer. Any thoughts would be great. Thanks!

 

[vdo1948]

Quick thought: are you sure you aren't set for kilometers rather than miles? 120 km/hr = about 74.5 mph.

 

[minet]

sounds like its kms , the 141 and 153 are both 3.0 drivers even then it would not be that much of a diff

 

[lakeeffect101]

speed sensor

If its not on KM then its you speed sensor down by you DD. $18 part at your dealer. Thats what happened to mine.

 

[Bushpilot]

Change out the speed sensor it will fix your problem

 

[dgreet77]

I am pretty sure its not on KM as the odometer reads in miles, I could check though. I actually don't have a book for my sled so don't know how to operate all of the buttons. Can anybody explain to me how/what they do or point me to where I could find this??

Also I did find the max RPM feature on the sled, but every time I tried to use it it just read 4500 RPM's, which of course is not correct. Does anybody know how to use this feature? Thanks!

 

[925balls]

any ideas on sealing up that speed sensor ive replaced 3 in 2 years the dealer says they are getting wet and going bad

 

[dgreet77]

TTT.

Wondering if anybody can explain to me how to switch my speedo/odo off of KM/h and back to MPH since I don't have a manual?

And how to use the MAX rpm feature as well?

Thanks!