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The original code on our 2009 35d was P067F code — “Cylinder 6 Glow Plug Control Circuit High”
And it is pretty clear the the #6 glow plug was not working (left to right #1->6).
Glow plugs have almost no resistance — perilously close to 1 ohm — which is why they can heat up so quickly. And also why they are hard to check with an ohm meter. As it happens all 6 of my old glow plugs measure roughly the same resistance with a Klein multimeter. So it is very unlikely that my #6 glow plug was really the problem. BUT… the diagnostics for the glow plugs are read by/through the Glow Plug Controller. So it is much more likely that the “Cylinder 6 Glow Plug Control Circuit“ that was reading “High” was within the Glow Plug Controller itself. In other words, the controller was no longer telling the #6 glow plug to turn on.
FWIW the round connector on the left side of the glow plug controller houses a single +12V hot wire that is directly connected to the alternator.
Funf Dreisig
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