Got a CEL which turned out to be open circuit, #1 glow plug. So I replaced it, cleared the code, then 1 week later same thing. Could this be the glow plug relay going out?

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Was the gp real bad? Did you measure it? Anyway, it could be the gp relay as the tracks inside are flimsy and could melt. It is under the intake manifold, not easy to get to.

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.

Didn't look too bad, little Carboned up, unfortunately didn't measure it. This is the third one I've replaced, only one to throw a code after installation.

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