No check engine light

[Jompe]

Dear x-people
I own a 2005 e53 3.0d since 2017.
The problem I face today is that the car is in great shape 😏.
The other problem is that the “check engine light” will not/never turn on if something were to go wrong with the engine.
I live in Stockholm, Sweden. We do yearly “smog checks” as we call “besiktning”. This year I ended up failing, of course, because the check engine light didn’t come up when starting the ignition, and on top of that not lightning up when I had one bad glowplug and a bad EGR.
I took it to “BMW” where they put in a new EGR vent and reprogrammed the ECU to see if they could get the check engine light back in order.
Cluster test is good. They took apart the cluster board and checked all of the led lights and so on. Nothing seemed wrong.
They suspected that the car has been manipulated. Someone has deactivated the signals that are being sent to the cluster in order to tell me that somethings up with the engine.
TheyI’m talking about the BMW SERVICE PEOPLE!!! Couldn’t fix this problem. Although they could charge me 12000 SEK (about 1100$ for the reprogramming and a new EGR, which to me felt dissatisfying.
Told me to contact the recent service place to ask what they did.
Is there anybody out there who knows what is going on?
Nowadays I’m using a Carly once a week just so that I can sleep at night. It’s driving me nuts.
Wishing well! Jon