As mentioned above, it's the rack position sensor. It is solely used for EGR control. If your EGR is blocked off (and it should be on these engines), the rack position sensor is entirely pointless.
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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)
Black Sheep:
1985 524TD 167K (TotalDumpster™)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
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