“The DPF is clogged, the check engine light is on, the car doesn’t move, but the AdBlue system is working fine. Can I remove the DPF and leave the AdBlue system intact?”
No, because the AdBlue system will quickly fail without the DPF.
1 Catalytic converter
2 Diesel particulate filter
3 AdBlue
If you remove any of these components, you need to follow the correct order. The third system is not designed to function without the second one, and the second one is not designed to work without the first one.
So, if, for instance, the catalytic converter is clogged, you’ll have to remove all eco systems. If the AdBlue system malfunctions, you remove it, and the rest will continue to function properly.
I hope this clarifies things.