My mph in my 01 540i seems off 5 to 10 mph off. Is this the computer and its adjustment? How can I change it to actual mph?
At what speeds does the error occur? What are you using to determine that the speedo is wrong? Most speedos have a built in error that gets larger as the speed increases.
Hi,
This isn't anything to do with Car Audio and associated electronics, so do put the question up on the E39 section.
I initially suspect that you have the wrong size/profile tyres on the car. As per above from Marco, what are you using to determine the cars speed? a GPS/SatNav unit or software? Instrument speed clusters I have read previously have a tolerance level of +/- 10% at speeds up to 100 mph and then after that it's quite a bit higher at +/- 15 or 20% I can't quite remember.
Cheers, Dennis!
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