reset EML check engine light

[evertonfc]

After years of electrical problems I left my X5 in an auto eelctricians shop for 4 weeks.
he installed a new battery and since then no problems.
apart from the check engine light EML wont go out.

I have had the car checked with a Snap On Solus Pro and also by the auto elec guy.
Both say there are no codes present, anywhere on the car, transmission, brakes, suspension, etc. all checked, No Codes Present.

The auto elec says BMW make them so you have to go to the dealership to get them reset after certain codes (my guess, "incorrect gear ratio", came up twice, first time it reset. recurrence of the Elec problem and it reappeared).

Can only the dealership reset them with some special BMW laptop?
How much should they charge for this?

I need it for the canadian emissions test for license sticker, else I would ignore it as I have done for the last 3 months.
Thanks