Hello, I have a 2003 s430 and whenever I try the open air feature (sunroof and windows open by holding the unlock button) it doesn't work. I do point it at the sensor on the door however the sensor looks sunfaded, could that be blocking the signal? If not any other suggestion would be appreciated thank you.

Try having the fob sitting directly on the sensor window, and try the passenger window the same way. You can also check the fob by looking at the output with a digital camera.