Passat CKRA TDI: Diagnosing P0401, P240F (and maybe P2201?)

Got an odd one in today, 2013 VW Passat CKRA TDI with P0401 EGR insufficent flow and P240F EGR system response too slow. I believe the dealer replaced the Nox sensor to repair the P2201 NOx sensor 1 bank 1 implausible signal but it came back as well.
The CKRA doesnt seem to have the cracked DPF issue as often as the CJAA but heres an example of one

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• #autos_vehicles
• #volkswagen
• #diesel_particulate_filter
• #passat
• #tdi_p0401
• #tdi_p240f
• #cracked_dpf
• #tdi_dpf