Fiat 500 1.3 Multijet strong exhaust odour.

Hello all, I bought a Fiat 500 1.3 Multijet Euro 5 year 2013 with 155,000 km. After the purchase I found that the car smells like exhaust gases. When you stand at the traffic light, the smell also comes into the interior. In the underground garage the exhaust smell is also very strong when I park and get out. I also drove in the other car after the Fiat, and the strong exhaust smell is so strong that all drivers driving behind me, he Although the strong smell is present, there are no errors in the fault memory. There is no smoke coming out of the exhaust, and all seals around the exhaust are tight. I can also read the live data, but which exactly? And what should they look like? Unfortunately, I have no experience with it. Maybe someone can give me a hint what it might be like?