Failure in the EGR in 1.6 HDI engines of the PSA Group

I leave you a link describing the breakdown and repair of the EGR valve
in many vehicles with 1.6 HDI motor of the French group, PSA. Currently these engines can be used in Citroën and Peugeot 1.6 HDI, Mazda 1.6 Mz-CD, Ford 1.6 TDCI and Volvo 1.6d.
Among other symptoms, it can be seen that the engine sometimes does not start or stops while it is circulating and the engine breakdown light remains permanently on. This is the link: www.blogmecanicos.com/2014/02/veria-val..gr-motoraes-hdi.html