BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)


Post Reply
Thread Tools Search this Thread
      09-24-2016, 10:17 AM   #1
New Member

Drives: 2010 128i 6MT M-sport
Join Date: Jun 2016
Location: WA

iTrader: (0)

Speedometer coding

After I got my radar detector installed in my 128i I realized that the analog speedometer was 5-7% fast according to the radar detector's built-in GPS. After googling the problem I discovered that this is a well known issue with basically all BMWs since the late 90s (maybe before IDK), Can this be fixed though coding?

I emailed Carly support about this issue since they list as a possible coding option except on US models and I quote their response: "We have found that the US model just doesn’t support this feature." So what is it about US models that doesn't allow this feature to be coded?

This has got to be one of the most annoying things for me about my 128i. Any info would be much appreciated.

Note: I am aware that I can turn on a digital speedometer which can display a true speed, but I am specifically interested in coding the analog speedometer.

Last edited by sporek; 03-21-2017 at 02:35 AM..
Appreciate 0
      11-13-2016, 01:48 PM   #2

Drives: 335i xDrive
Join Date: Sep 2014
Location: Rockland, NY

iTrader: (10)

Garage List
There is a way to modify the values but is not simple and would be difficult for a new coder.

In the Kombi you modify: K_ZAHL_TACHO and K_ZAHL_TACHO_KOMPL with NETTODAT coding by changing the values.
Appreciate 0
      11-13-2016, 04:16 PM   #3
Brigadier General
JimD's Avatar

Drives: 128i convertible
Join Date: Apr 2009
Location: Lexington, SC

iTrader: (0)

I've read what DaZuc said but I've never seen a post where somebody successfully did it. I have the digital which reads true mph and I ignore the stupid regular speedometer. This is one really poor decision BMW made in the design. I've read the excuse about German traffic laws but I don't live in Germany and I don't need a Mommy to tell me what to do. BMW could easily make this codable and has decided to make it very difficult so we don't do it. No other reasonable explanation. In the U. S., the cars should come with the speedometer reading accurately. They cost enough for a technician to spend a couple minutes setting them up properly.
128i Convertible, MT, Alpine White, Black Top, Taupe Leatherette, Walnut, Sport
Ordered 5/22/09, Completed 6/4/09, At Port 6/9/09, On the Georgia Highway 6/13/09, Ship Arrived Charleston 6/24/09 at 10pm, PCD 7/21/09
Appreciate 0
Post Reply


coding, speedo error

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -5. The time now is 08:00 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.,,,,,,,,, logo and trademark are properties of BIMMERPOST