What is this warning light?
 

The car is on jackstands after trying to put a new clutch in. This light flashed when I tried to run it in 1st accompanied by a clunking noise. I can't find a reference to what these may be in any online documentation...

http://986forum.com/forums/uploads02...1670298650.jpg

http://986forum.com/forums/uploads02...1670298664.jpg

My first guess was a slightly non-standard break wear light. From the MY 2003 manual:
http://986forum.com/forums/uploads02...1670307186.jpg

Now, I'm seeing it as depicting a wheel that is lifted above the surface..? Not a normal light on a Boxster but give this a try for me... Your car is on Jack stands and I'm guessing that your car has level sensors. Can you lower it from the stands to put some weight on the wheel and see if the light goes out?

Ding ding! You win the prize. Put my wheels down, took it for a spin and no light

Now to deal with my cylinder 3/4 misfire and o2 sensor missing :mad:

Just to be clear, this is most likely the traction control light, not anything to do with brake wear.

First, the location is wrong for brake wear, and the image looks different.

2nd, having the car in the air has nothing to do with the thickness of the brake pads

third, having the car in the air would be likely to confuse the car as the front wheels aren't turning.