Date registered: Oct 2004
Vehicle: 2010 S550, 2005 S500 4-Matic (sold), 1978 450SL "Christine" (sold)
Location: Tampa, Florida
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 76 Post(s)
Welcome to the forum.
Unlike some cars, there is no separate control button for the door.
1) Unlock the driver side door. This also unlocks the gas tank door.
2) Press on the front part of the gas tank door until the rear part pops out a bit. The rest is obvious.
2005 S500 4-Matic