cam69ss
Thanks for your reply, I carefully re-read the inspection report: your are right!
Duke2.6
Thanks for your instructions! I will run more tests as you suggest. So far it looks like my EGR valve is broken.
I wonder whether a broken diaphragm could lead to a vacuum leak that could be responsible for the increased HC as suggested by manny and boneheaddoctor.
Also, I will shorten the R16 resistor (I pulled the 750 Ohm original resistor) to retard ignition.
Then I will make sure the catalyst is hot.
I may also replace the spark plugs and double-check the ignition system.

I hope that will suffice to pass the second test.
Thanks to everyone, Bruno