Slow, steady knocking sound before ignition (and after) from front side passenger door/window.
Knocking sound feels like it is coming from the front side passenger door/window. It is steady and
slow, medium volume. It sounds just like somebody is outside, knocking, trying to get your attention.
Knocking begins as soon as the key turns onto semi-on mode where just radio and windows work.
When I fully start the engine the noise stops for 1 second then continues as before.
Haven't tried driving it or revving it. Tried opening/shutting the passenger door/window to no avail. Car
has 240,000mi on it.