My 1998 i30 has code P0325 P0440 P0400 P1448. I tested EGR Control Solenoid Valve and looks like it is bad. There is no click sound when I apply 12 V to green adapter positive and Negative connection.

Now I want to remove this EGRC valve and replace with new one but I am not able to figure out how to remove it. Per Image, there is one Nut under the Green adapter shown but I am not able to open Nut due to tight spot. Green Adapter has bolt which is sitting on steel plate and Nut under plate is holding bolt. Anyone can give me idea how can I open Nut under the adapter ?. I tried to use 10 mm ratcheting wrench with swivel but I am no having leverage to open nut. I did use WD-40 as well.

 

Bend the metal slab its sitting on back.