yboy82 1/16/2011If you already try to reset it and it will still came back, try to diagnose your vehicle with a scan tool to determine what is the stored trouble code your light is indicating. And you can post here the extracted trouble code.
Toolman 4/2/2011There is also a reservoir that is specifically for 4-matic hydraulic fluid that would be the one to check. The fluid is available thru mercedes dealers and is about $20 a quart. When mine was low the light would come on. The 4-matic would also not work. It is a plastic tank with a black rubber cap that pulls out with a small dipstick on it. Another reason the ligt is sometimes on is that there is a group of modules under the hood against the firewall. My 1993 300TE had a bad seal under the hood and everytime these modules got wet the light would stay on. I would open the compartment, dry it out and it would then again be fine. I fixed the seal.