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that is purge valve for evap.....deals with tank vapors. egr is exhaust gas and would be a different unit between exhaust manifold and throttle body. On my mazda, carbon would start making that egr valve not close and would cause car to die at idle. cleaning the carbon out of egr with brake cleaner was the fix. not sure this would be the case for the xB tho...
 

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i believe this is the one to look for......under engine cover somewhere? can't tell from pic but i think so.....

 

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Hmmmm, weird, at first I was gonna say it might be automatic thing since I see dipstick but it is in both pictures. My 5spd is hooked up like your pic where hose from tb goes to same purge valve like in your pic. Maybe I don't have the egr valve like in the bottom pic either. Not where I would have expected to see it. Thought egr would be separate thing from the evap purge valve setup.
 

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P0442 = evap small leak
P0420 = catalyst system inefficiency
P0441 = incorrect purge flow
P0446 = Evap vent solenoid

All of these seem related to the purge valve in your pic, nevermind the egr one in the 2nd pic. IMO, if you replace that purge valve all codes except maybe the catalyst P0420 should go away but maybe that one is also related to purge valve as a colateral code from the others. Replace the purge valve and clear codes and hopefully none come back.

You can test the purge valve by sucking on the hose nipple and see if it holds pressure on your tongue. If air passes thru it or doesn't hold suction then valve is bad but the electric part could still be bad. Check the connection to it and make sure both wires are intact on the harness side at the plug. It is fairly common for one to get pulled loose from plug. You can also buy the plug connector separately and splice it into harness if that is the issue. If inconclusive just get new valve. They aren't crazy priced.
 
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