Humming coming from my 01 Boxster, any suggestions on what to look for

[Jasper7821]

Originally Posted by BYprodriver

Best way to listen for a noise is to drive close to a solid wall at night so the noise bounces off the wall back to you, you will be amazed at the difference.

I did that, but unfortunately under about 25mph it doesn’t make the noise. Hard to find a long enough wall with no one around to get up to speed for a few seconds to listen.