Quote:
Originally Posted by Mxfrank
The glow plug light is telling you that you have at least one failing GP, simple as that. Replace them as a set and go another 150K miles before you have to think about it again.b
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This. Mercedes engineered the car to tell you when it has a fault in the glow system. And what it does is not initially illuminate when you turn the key to the ON position, then it will illuminate when the car is running. So it's a tell tale.
Buy all new glow plugs. Replace them. They're usually the part that goes wrong. There's only 3 parts in the glow system; the glow plugs, the wiring, the GP relay.