Intermitent Glow Plug Warning Light

malcolm E53 AMG

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The glow plug heater warning light in the instrument cluster seems to have become lazy and doesn't always illuminate on startup. There are no other synptoms, car starts OK, and the light does not come on during the journey.

Has anyone experienced this, my first inclination is that the relay that controls the warning light may be faulty. Altenately I suppose it could be a glow plug but from what I've read on the forum the symptoms are different, the light stays on for longer periods or comes on during the journey.

Any ideas!
 

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