Very high -- especially the Febi switches.

I did this replacement (with a Febi switch) about 2 years ago and the alignment took an eternity and the switch failed shortly thereafter. I replaced it with the original the OEM switch (which I thankfully saved) and it worked with no alignment and is still going strong today -- with just intermittent failures in Park during very cold weather.

If you buy an MB switch, your problems will be solved.

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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