Need Help On My V40 (not Sure If Turbo Problem)

hi, i just had my v40 2000 1.9t serviced for 105000 miles maintenance 3 days ago. during the service they found out that the radiator was cracked and a small fracture was found on the intercooler. both of them were replaced including my timing belt as advised by the service mechanic. But this afternoon as i was driving up hill i've noticed the car abruptly lost its power (like i felt a blow of air and air was dominant than the gas.) and check engine was on. right now if i start the engine idle is low and fluctuating and as i drive it there is whistling sound and gets louder as i step on the gas.

what do you thinks wrong with my car? do you think its the turbo that's making the whistling sound?need your feedback. i dont have any experience with turbo charged cars so dont really know if their broken. what's the symptoms of a broken turbo? pls. help me. thank you.