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It switches the transmission between "Economy" and "Sport" mode. Economy will provide smoother shifts and is fine for everyday driving. Sport mode tells the transmission to let the engine rev higher, and shift quicker, to get a sportier feel...
C= Comfort S=Sport Mine is a 2010 model and the mode is indicated on the dash
C is for comfort mode, S is for sport mode. In C mode the transmission will shift early, and often take off in 2nd gear. In s mode the transmission will always take off in !st gear and stay in each gear longer, giving better performance, but poorer fuel economy
ecu can come on with a leaky injector chek for leaks if at the 90,000+ mark.
W = Winter S = Summer They are the driving mode for the car, whether it is winter or summer.
It mean " By Land, By Air and By Sea" the company was known for providing the best engines for each mode of transportation.
They are not air bags, they are dampers that keep the cars body level while the wheels are not level, it is a part of the suspension system and is used mostly in comfort mode and on cars that have offroading capabilities. For instance if you were in comfort mode the car would make the suspension softer and in power or sport mode the suspension stiffens for the passionate driver that would like to feel the road that they are on, particularly useful for winding roads.
The sport mode changes the shift points on the transmission.
C= comfort, S= Sport When your in C (comfort mode) the car drives like a regular luxury car. The suspension is soft, and the transmission shifts at lower rpm's, so your not revving high, basically use this mode for regular driving, it feels the best for day to day driving and will give you the best fuel economy. S (Sport mode) is for when you want to have a little fun. The suspension will tighten up and become noticeably stiffer, and the car will accelerate into higher rpms before shifting. So you got a sport like feel, the car revs high in every gear and down shifts rather quickly as well. This mode drastically reduces your gas mileage though!
S mode is for Sport Mode whereby the gear upshift is delayed.
Aggressive driving.
If the car shakes when you press on the brakes, you probably have warpped brake rotors, and the squeak is probably some worn out front brake pads. I would have your rotors checked and either replaced (which Mercedes highly recommends or re-surfaced)