Waded in deeper and removed all the small vac hoses from the distribution piece in main vac line going to the brake booster. Although very dirty, nothing looks like it is broken or leaking under the manifold. Since the fault code relates to the EGR system I am thinking that the pressure converter under the IM maybe be marginal (there are some posts on bimmerfest and e90post that point this way). The OE item is $140 but I really don't feel like buying a chinese copy and later having to go in a second time.....

On removing the heatshield that covers the vac hoses on top of the turbo I found some very bad looking red and blue hoses. Eventually I will take off the bracket that holds the pressure sensors and the pressure converters. First I just want to reinstall vac lines that control the EGR. If I pull them all at the same time it might become confusing.

I disconnected the hose of the EGR valve that resides under the turbos. After removing the aluminium stiffener plate I could get needle nose pliers up under the turbo and disconnect the red hose.

If only I could persuade myself to go for another session cleaning the Intake with Purple Power. I ordered some long handle brushes to get in there.

Pictures later!

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2003 4.4i black ext./black int./black headliner (kid's runabout)
2014 535d X-drive, M package, silver/black interior

Sold but not forgotten:
2009 E70 35d, black ext./black int./black headliner (sold 2021)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Other hardware:
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles.