[Asa7LCi]

I just got my 2006 M5 back from the body shop. I took a pic of the milage before i gave them the keys. It was reading 93,470.

Today i get in and the first thing i do before leaving is check the odometer and it reads...
93,469.

The MPG was around 12mpg before turining it in and it read 7.8mpg today. The trip odometer had also been reset.

Is there any reason this would happen for a bumper, headlight, and fender removal?

[LOW4LYF]

Nothing to worried about.

Battery was for sure disconnected. I saw already a mismatch between the cluster and backup ECU +- 20mls…. All good.

[Asa7LCi]

Originally Posted by Figurka

Nothing to worried about.

Battery was for sure disconnected. I saw already a mismatch between the cluster and backup ECU +- 20mls…. All good.

Thats what i was thinking since it was only 1mi. Thanks 🖒

[NYBulldog]

This exact thing has happened to me before on my 06 M5 too lol (1 mile). No one touched it but me. No worries man.

[jpnh]

Nothing to worry about

[dzvero]

I know mpg is reset when battery is disconnected but odometer.... should not roll back

[The Wind Breezes]

That is extremely interesting. Sounds like a software bug.

[Dackelone]

Only when the car is new(late model BMW's) is it possible to change the mileage. And only when the car has less than ten(or so) running hours - and you have the proper BMW scan tool. This is why when everyone picks up their new car at the BMW Welt... the mileage is 0 or 1 mile. The mileage can be reset downstairs in the workshop - before the customer can pick up the car. But once you get past the first 10 hours of engine operation... this feature is disabled.

Vehicle mileage is also recorded in the car's other ECU's like the engine and trans, FYI.

[The Wind Breezes]

Originally Posted by Dackelone

Only when the car is new(late model BMW's) is it possible to change the mileage. And only when the car has less than ten(or so) running hours - and you have the proper BMW scan tool. This is why when everyone picks up their new car at the BMW Welt... the mileage is 0 or 1 mile. The mileage can be reset downstairs in the workshop - before the customer can pick up the car. But once you get past the first 10 hours of engine operation... this feature is disabled.

Vehicle mileage is also recorded in the car's other ECU's like the engine and trans, FYI.

Oh, believe me, you can absolutely change the mileage...it just requires some skills with eeprom reading and reversing if nobody's made a program to do it easily which I imagine they probably have. Very very unlikely that the bodyshop did it in this case due to the specialized skills required, but it's absolutely possible.

[ShakyDog]

Since it was starved for fuel it start to burn miles to supplement the deficiency.

Steve

[hdmark]

clearly the shop put your car in reverse for a little bit...

[LOW4LYF]

Originally Posted by Dackelone

Only when the car is new(late model BMW's) is it possible to change the mileage. And only when the car has less than ten(or so) running hours - and you have the proper BMW scan tool. This is why when everyone picks up their new car at the BMW Welt... the mileage is 0 or 1 mile. The mileage can be reset downstairs in the workshop - before the customer can pick up the car. But once you get past the first 10 hours of engine operation... this feature is disabled.

Vehicle mileage is also recorded in the car's other ECU's like the engine and trans, FYI.

It's not... you have a master and backup... in our case the Cluster and FEM... Clusters is always set, the second ECU depends on the model... FEM, BDC etc... you can swap the Transmission and code it without any issues.

You talking about Fasta Data? The current millage is written down in almost every ECU only for Diagnostic.

[Dackelone]

Originally Posted by Figurka

It's not... you have a master and backup... in our case the Cluster and FEM... Clusters is always set, the second ECU depends on the model... FEM, BDC etc... you can swap the Transmission and code it without any issues.

You talking about Fasta Data? The current millage is written down in almost every ECU only for Diagnostic.

All I know is that at the BMW Welt(from my friends there)... is that they can roll back the odo - back to "zero" miles/kms - as long as there is not more than 50 miles/kms and as long as the car has not been running for more than 10 hours(engine time, I think?).

Yes, you can code the instrument cluster miles/kms but then you also have to "roll back" the mileage in all the other ECU's - that gets kind of tricky.

[latigido922]

Nothing to worry about.
some ECU's has bug and when service software rewrites current mileage, this bug clears the odd digit and dashboard has been set to even value..

wbr,

[VRG_135]

Originally Posted by The Wind Breezes

That is extremely interesting. Sounds like a software bug.

A software problem? On one of our cars? Nooooooooo way.
(hear the dripping sarcasm)

[Dackelone]

Originally Posted by latigido922

Nothing to worry about.
some ECU's has bug and when service software rewrites current mileage, this bug clears the odd digit and dashboard has been set to even value..

wbr,

Just talked this over with my friends from BMW AG. They tell me that when a car gets a SW update the mileage can change anywhere from one to five miles!

I learned something new today.