Hi Guys, I signed up to this forum having read a few of the topics because I believe I have the answer to (half) of this question.
On manual gear change versions (at least UK spec) there is an auto stop/start function which stops the engine at traffic lights, queues, etc in order to save fuel and then starts it up again when you depress the clutch.
If this gets on your nerves, there's a switch to disable the system. I think the switch uses one of these two blanks.
BTW the auto version of the boxster has the fuel saving stop/start on the PDK automatic as well. Not sure why it's not on the Z4.
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