And when you wish to have spark, and the sender is deteriorated and frayed, the ignition comtroller gets no feedback, and stops firing?

Thanks Steve. I was having no-start and stalling problems in the extreme heat last week, and the sender unit was in pretty bad shape. The engine would initially catch for perhaps half a second, and then shut down. I am glad it was a relatively simple fix.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black