Nice that it tells you when it goes bad (throws a code). When it does finally fail, install the the relay socket (base) to make it easy to replace the next time. Of course, if it lasts 10 years why bother!

What is an EGR lift switch? There is only the vacuum line going to the EGR. There does not appear to be any sort of feedback coming from the EGR. I suspect that it is set up nearly identical to the 606.

-Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.