What is the first sensor to the right of the dipstick? The second one to the right is for the coolant temp gauge I believe. A quick search through the FSM wiring diagram turned up nothing.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked