Does not start paste 206 hdi

My car does not start, ignite all the indicators and sounds the relay when giving part, but I do not start, they indicate that it can be the impact sensor, but I do not know where it is, since the paste I have is HDI 1.4 French ....... Any idea ???

Hello, how are you, to help you need some information, you scanned 206, venias circulating and went out or you went to turn it on anymore, recognize the ignition key, you discard mechanical problems of electronics, I tell you I am a mechanic and I have had problems of fuel lines filters, deposit, obstructed pipes, distribution strap, I also pass problems in Isolated pine Complex there are many things to verify, if you give some information you want something we can provide hug !!!

The model must be checked since it could have a mechanical or airbag inertial switch