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Originally Posted by ppbon
Sounds like the secondary air injection pump.
It adds extra air for the emissions until the cats warm up, then it shuts down.
Happy Boxstering,
Pedro
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Could it be that even if the noise happens when the engine is off?
I'm pretty sure the noise is electronic, almost like the noise a microwave makes when the timer goes off but nowhere near as loud.
I hear the noise when the key is turned to the position before turning the motor on.