Speedometer help nedded

[BulletTooth]

I have a weird problem with my speedometer. It shows the speed a little higher than the actual speed by about 10% or 5MPH, however my OBC seems to read the speed ok, is there any way to adjust the speedometer to read the speed correctly?

Thankx for your help!

[Filehorse 525i]

You have just come face-to-face with a BMW-designed error. In Europe, there is a stiff penalty if a car manufacturer puts out a speedometer on which the displayed speed is less than the actual vehicle speed. To ensure this doesn't happen, BMW designs in a bias where the speedometer will always read ~5% higher than the actual speed. I've posted this same question and based on what I've been able to find out, there is no apparent fix. Like you, I figured there must be some "adjustment" where you can calibrate the speedo. If it's there, I haven't found it yet. It really annoys me when the average Dodge Stratus has a more accurate speedometer than my 2002 525i. The error only affects the speedo. The odometer is not biased.

[BulletTooth]

Thanx for the reply. I guess I'll just have to live with it. What's weird is that the OBD reads the speed correctly. I have my limit set at 80mph and it sounds the alarm at exactly 80mph at which time my speedo actually shows 85 already, that's why I thought that there might be a way to fix this problem.
If anybody else has any takes on this subject I will sure appreciate it.

[Filehorse 525i]

You also correctly noticed that your average speed calculation and your speed alarm are correct. It's only the analog speedometer that's affected. I noticed the error when comparing it to my StreetPilot III.

If you ever discover a "fix", please send me the link.

Otherwise, just drive faster....!!