What is it and why is it flashing?thanks

 

I think its the over drive button indicator. I wouldnt know because mine doesnt work at all. The S is for "Sport" (HAHAHA) mode. You might have a sensor problem if its flashing.

 

thats the sport opption on your car with it it takes longer to shidt gears if you have an auto. it tkes more gas but you can hit those higher speed faster. i use it on my families accord and have been able to out race my friends toyota supra. it flashes if it needs to be fixed (if i remember right)

 

yeah, some sport option. we call that Over Drive.