gjones8131, did you disconnect the EGR tube from the inlet manifold and clean the port in the inlet manifold? That connection is difficult to access, plus there is tubing clamp on the oil filter housing that must be removed so the EGR tube will pull out of the intake manifold. When I disconnected the EGR tube on our 1995 E320 the port had a light caking of carbon which was easy to remove. Cleaning that port cleared the EGR warning light on the instrument panel.

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Fred Hoelzle