At about 100,000 miles, my kickdown switch starting "sticking." I knew the day would come when I would have to replace the switch. Believe me, I use it a lot, and I know sometimes I just put my foot to the floor HARD!

I purchased a new kickdown switch from the dealer, roughly $30 if I remember correctly. It took me about 15 minutes to replace... relatively straight forward, just kinda of tight with the carpet down there and all.

Good luck!

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)