Re: '06 325xi Speedometer Inaccuracy


"Schmoe" <schmoe@xxxxxxxxxxxxxxx> wrote in message news:4575ca99$0$5498$ec3e2dad@xxxxxxxxxxxxxxxxxxxxxxxxx
Jeff Strickland wrote:
"Schmoe" <schmoe@xxxxxxxxxxxxxxx> wrote in message
news:4575bb90$0$5541$ec3e2dad@xxxxxxxxxxxxxxxxxxxxxxxxx
Schmoe wrote:
I'm sure this has been covered since when I google the subject,
there are some various hits. My '06 325xi reads about 6-8 mph
faster than the car is actually going when at highway speeds. The
dealer refuses to address it stating that 5mph variance is allowed
an legal. First, it annoys the hell out of me to not know my actual
speed especially when it comes to upper highway speeds and avoiding
tickets. Second, it's a leased car with 15k per year which by my
calculation, I'm getting ripped of on mileage since it's reading
more miles than the car has actually gone. This is probably around
750 miles/year I'm losing to this scam.
Can anyone suggest a method to get my dealer to fix it if there is a
fix? Has there ever been a class action suit on the subject? Thanks
for any help.

Thanks for answers. If I read it write, some of you are saying that
odometer is not taken off the same data as the speedo therefore my
lease mileage will be accurate? I'll do the milepoint calculation or
use a GPS when I have a chance. I've owned 2 Audi's, a Volvo and
assorted other cars and not one has had an inaccurate speedometer
much less had it intentionally. I like the car but this is a silly,
unnecessary flaw.


I've not owned any of those cars, but I am pretty sure that all of
them have the same "flaw." Perhaps the error rate is not as great as
you think the BMW's error is, but I am not sure the BMW's error is as
much as you think. I have a '94 3 Series (my second one) and the
speedo says 80, and a measured mile takes about 46 seconds. My
daughter has an E46, but I haven't timed a mile ...

I clocked the BMW on the highway matching speed with my wife in our Grand Cherokee. At 80 MPH it read 7 MPG over the Jeep.


That is not an accurate means of testing. It requires the pace car to be accurate, but you haven't confirmed that yet. You have gathered anecdotal evidence at best. If the BMW was wrong by 4 mph and the Jeep was wrong by 3, the difference would be 7, but both would be accurate enough that you'd never know there was an error.




None of my cars have ever
had any noticable speedometer issue. When I'm on a major highway doing 80 MPH and multiple cars are passing me consistently, something's not right.


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