207 cc noise working exhaust emission malfunction

Hello friends, my problem is that the vehicle is running late and a knocking is coming from the lower part of the steering wheel just before it starts. By the way, 1.6 turbo engine. In the part of the errors, it says that the exhaust emission system is malfunctioning.It also sounds like the engine sound is working intermittently at idle, while the gas is running, the vehicle is spinning with a flurry.

hello car at how many thousand km

At 142 thousand kilometers