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This is a nightmare to diagnose. Some really the list of possible reasons is endless. I've come across battery drain due to:
- improperly registered battery.
- TCU in boot not shutting down.
- Comfort Access module fault or even door handle fault related to comfort access. Possibly even key fobs.
- CAS fault
- EGS shorting out
- any aftermarket devices installed?
The only way to really nomad row it down is to start pulling fuses. Let the car go into sleep mode, you can fool it by wedging door / trunk / bonnet clips. Connect a multi meter in series to the battery, then start pulling fuses. After each one you may have to wait for car to go back in sleep mode. Have someone monitoring the multimeter when fuses are being pulled and see if there is any change in current...
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