Hi, I'm after some advice and not sure where to post this so I thought here's as good a place as any! I've got a fault on my CLK 55 AMG (W309). This seems to have happened after the ignition key was turned when the engine was already running. Just after this, the engine coolant warning came on, and the fan started playing up. The car has been on the computer and fault code P1999 has come up - can anyone tell me what this indicates? Any advice at all would be great, cheers!