I am hearing a faint ticking sound once every ~5 seconds like clockwork coming from what I suspect is the engine bay close to the driver's feet. I can hear it in the cabin and I could hear it when I listened from the outside near the wheel well. I've heard it while driving and after the car has been off. It's not always happening, and I can't figure out a cause. It might drive me insane unless I figure out what it is, does anyone know?