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Had this come into the Zedshed Cymru shed today on a 2.2, all bulbs working so its telling porkies. Plugged in BMW Scanner 1.4 and took a look at the lighting coding and deleted the light check on all the left hand side then cleared the codes, bulb warning out and indicator back to normal flash speed. It would appear there is a fault in the light check module that caused the fast flash, now the bulb check has been switched off on all the left hand side its returned to normal. Will see if the fix lasts.

On mine a bulb was showing on scanner as having failed (even though it was actually working). Pop a new bulb in and it was back to normal.

Interesting, new bulbs were put in but fault persisted so suspect the lighting check part of the module.