2009 159 1.9jtdm with a remap, 96K miles.
Last week I started to feel the sluggishness in 2nd and 3rd when pulling from lower revs. All fine above that, just annoying and sluggish.
As I have done 3 other EGRs I got all the gear out and cleaned the valve thoroughly.
Hot soapy water for the casing. Carb cleaner for the finishing job. Slight grease of the spring assembly. Check the solenoid operates smoothly.
Sprayed into the intake, cleaned what I could.
Dried all the components. Put it all back together.
Let it tick over for 5 mins. Test drive, different car!
Dead easy to do, should be part of the service schedule I think. I'm happy for it to still be there, the engine was designed with it in mind, so am a little reluctant to get it "deleted".
Oddly the gaskets are the standard large hole ones, thought a 2009 car would have had the amended small hole gaskets. Might order and fit those at another time.
Anyone in the midlands are wants the job doing, drop me a PM and am happy to help.