Q: EGR Flow

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I have a P0400 error on my Ford Escape. I am attempting to remove the EGR valve. Due to its location, it is extremely difficult to access the nut on the EGR exhaust tube. I am pretty sure it is a 1 1/16 inch nut, but I have not figured out a way to adequately obtain enough leverage to get the nut off, give the limited space. Can anyone recommend a method of removing this nut on this particular make and model?

My car has 110000 miles.
My car has an automatic transmission.

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