thanks for all the replies. I am too scratching my head..

I think brakes are OK. I did several tests where I put car in N and it was moving without any binding on brakes. Unless the SBC system engages somehow during driving and impedes the wheels.

I bought diesel injector tester kit Lhttp://www.princessauto.com/pal/en/Testers/Fuel-Injection-Test-Kit/8504748.p

We will test the injectors in upcoming days.

Would it be safe to assume that the car would throw codes at me if CATs are blocked?