Fiat Strada 1.4 mechanical problem

Hello everyone, I am new in this forum and I tell me a friend who is very good !!! The reason for my consultation is as follows. I have a Fiat Strada year 2012 engine 1.4. A couple of days ago I has been showing me on the dashboard two errors one is D-020 and the other is D-017 I wanted to know if someone can tell me that it is, also when it sometimes starts it fails too much, the control unit tries to stabilize the march but the engine is turned off, it does it twice and then starts normal. I would appreciate if someone can help me. Thank you