Well... I actually wanted to avoid unscrewing the can, but apparently there's no other option

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'//edit: So, you remove the two nuts underneath the can, and then somehow you can pull the rod out? What kind of mechanism is behind that? (I just want to make sure I'm not doing anything wrong).'
And are you sure it's unlikely to be the solenoid valve for turbocharger pressure regulation or the exhaust gas recirculation (EGR) valve?
Greetings.