I appear to have a glow plug failure (code P1369) which according to my cheat sheet is a cylinder 5 or 6 failure. (E 300 D) I can tell the plug is not working because of the knock when started cold. I put this set of 6 in, Mercedes brand made by Bosch, 5 years ago last November. I have records on the previous owners installation of 6 Bosch brand that were installed 4 years previous to that. It seems to me that 4 to 5 years is too short a life for a glow plug. Granted that the others might go many more years, but on this car it is such a major deal to get to the plugs that I will change them all once the intake manifold is removed. (dealer charges $530 labor) I have bought a set of Beru's to see if I can get more life. Has anyone used Beru's in a 210, and if so how well did they live?

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'97 E 300 D