better mpg after alternator change?


Registered User
my alternator died last week so fitted a new one. Ever since my mpg has increased on my trip. It feels like I'm using less fuel is this possible?

Broken Byzan

Photographic Moderator
Staff member
VCDS Map User
i assume you disconnected the battery ? It's more likely the ecu reset from the loss of power that's reset the trims potentially making her more frugal if legacy codes were present causing issues or preventing adaptions


Registered User
Ah cool cheers so should be able to pick this up and be able to clear them? If they come back