Заводится и глохнет фольксваген пассат 2006г tdi 2.0

Starts and stalls Volkswagen Passat 2006 tdi 2.0 My friend bought a car in which the engine starts and immediately stalls. I connected diagnostics, diagnostics showed that there are no errors. It is strange where to look for the reasons why the engine behaves like this, immediately stalls. The search began by exclusion, the first thing I turned off was disconnecting the pipe from the turbine, in order to exclude the catalytic converter, you never know it was clogged. But after starting the car spun and immediately stalled, it is clear that the catalytic converter is in order ...