The EGR valve can be replaced in ten minutes, but to clean out the EGR passageway on the 119, I think you have to take the intake manifold off. I'm not convinced that EGR passageway obstruction is a recurring issue with the 119.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles