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Did the line come off of the vacuum pump or off of the thing on the fender?
In my 1996 E300D (W210, OM606NA), the only clear vacuum line that goes from the vacuum pump to the driver's side inner fender goes to a solenoid valve under the ABS pump. It is difficult to access but your friend might try removing the window washer reservoir and looking for a black rubber connector that doesn't have a plastic vacuum line sticking in it.
If the line came off of the vacuum pump, there are a couple of multi-arm rubber connectors that distribute vacuum; the clear line came out of one of them, it should be easy to see.
I don't know what the solenoid does but it might be related to the codes -- fix it and see.
The attached picture shows a new 606 motor mount (left) and a bad, collapsed motor mount (right).
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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