Originally Posted by chrisko
Not too sure, this may be way off but have you tried cleaning your air filters/intake?
Well, it's first service (in my possession) was about 4 months ago. They replaced the air filter at the time, and in fact I installed a replacement K&N (E-2022) filter last month and this thing still shows up every now and then. The actual intake hasn't been looked at though, no, but I understand your thought process.
Strange thing is, that "suction" noise seems to be coming from underneath the car - which could be related to the exhaust somehow - but I'm not sure