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Someone has bypassed the egr cooler assembly, in the pic to the right of the right pipe. Coolers are normally bypassed as a result of excessive pressure in the cooling system as the can fail and let gasses into the coolant.
The pipe on the right will go to the right outlet and the other side of the joiner should somehow go to the left but depends how it's been bypassed as to what you need to do

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I've seen plenty of coolers bypassed with no issue but would prefer it to be connected if it were mine.
Imagine it's faulty with gasses escaping into the cooling system or else it would be connected.

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