Although that part is apparently just a potentiometer, it is very expensive -- between $400 and $500! I've often wondered whether one could just take it apart and clean the contacts or whatever.
Mine does not (yet) throw any codes but does occasionally hesitate at low (parking lot) speeds. When one presses harder on the foot feed the sender finally figures it out and the car lurches ahead, a somewhat disconcerting reaction. One learns to keep a foot close to the brake when it does that. 
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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