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This is on a 2008 F550 with the 6.4 L Turbo Diesel. Previous owner might have played around with it a little, but after I brought it home I found the cables/sensor hanging around as you see them in the picture. What are they? Can they stay there, or do I need to do something?
Yes, he deleted the egr and cooler. Those are connectors for the valve and I believe flow sensor. He left one sensor plugged in for what I assume is to put check engine light out. He may or may not have had a retune of the PCM when he did the work.
The sensor that remains plugged in is the EGR temperature sensor 2 (EGR temp 1 being EGT pre-turbo). The loose one in your photo there is the EGR flow control motor assembly.
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