Just picked up my 2007 335 coupe. Love the car. Only 15,000 miles. With CPO I have 3 years coverage, and because I financed at least $7,500, I get an additional 2 years of free maint!!!!

I went out to make some settings using the I drive, and heard a noise from the engine bay. Every 25 seconds for about 3 seconds. Sounds metallic, like a motor is running. Car has not been driven for a few hours.

Any idea what this could be?