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air flow sensor replacement for 1986 190E 16V, 155k miles

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Hello All,

My high miles (new to me 16V) has a badly
worn air flow sensor that I want to replace.

I was horrified of the prices for a new one.
Does anyone have a suggestion on where to
get such a sensor (potentiometer only) and
steps to calibrate it?

I am in Colorado, but will be in Germany
later this month. The part is made by Bosch.

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