Good morning to all... every time I do I feel!!!!

I had in my hands a C3 Picasso 1.6 hdi edc16 that I should disable the egr.
It was read without problems with the kessv2, but my doubt concerns whether certain items on the citroen is the warning message of the same kess.

It is true that in these machines it is easy to lose the encoding injectors?

It is the first citroen that I do, but not the first 1.6 hdi.
Some time ago, I had the opportunity to study the 1.6 hdi mini always with edc16c34 and I have had no problem...

What can you tell me about it?

It is a problem that affects only those that fit ecu sid, or is it a problem with the ecu bosch?

Thanks in advance...