I have faced with non- start problem with my 19JTDm too.
It works ( does not works actually ) in two ways for me.
First, it is impossible to start engine after some drive than hot. It cranks but do not start.
Second, It stops in few seconds after successful start with interrupt message INSOFICIENT OIL..... and repeats first as above.
Looks like this problem depends how hot engine is since after 10 minutes stay it is OK.
I have visited service today. We have plugged MES shows P2009 up.
It was not clear what exactly to do but code explanation include Low Signal message means problem is electrical.
I have asked mechanic to check all dedicated items and he eventually suspect dodgy socket ( See picture attached ).
It is a socket for power supply for flaps motor. Contact were really rubbish.
He has re-soldered this socket but it does not help unfortunately.
Car has started perfectly. I have leaved garage and some minutes later I have feel power loss at neutral which I have never feel before.
Looks like problem become sharper. I have moved aside and car stops. We have towed car back to garage. Car has started from rolling btw. Will tell you further result tomorrow.