The EGR computer and I use that term loosely, is located behind the passenger side panel kick plate. I guess technically it is just a solid state circuit board. I don't understand why Mercedes installed it only in the 85 models. Lots of R&D just to use it in one model year.

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1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair