[Marcoose]

I've installed both MHD and xHP on the Z4 about 3 years ago.

Hopefully totally unrelated, but in the last 3 months I've been having massive issues with battery drainage. Something is staying on after the car is off. The battery is OE, 14 months old, and the alternator is brand new.

The thing is, Friday morning I've reverted both engine and transmission maps to stock for the upcoming SMOG test. And drove over 200 miles to reset all gizmos. And lo and behold, the battery stayed fully charged through the weekend. With the ongoing issue, I was expecting it to drop to approximately 60%. Go figure.

With all that, has anybody experienced problems with MHD/xHP and battery drainage ? Is there even anything in the MHD/xHP modules that could keep something on after power off ?

Thanks.