Problem with a Peugeot

I have a Peugeot 206 does not start the scanner marks 6 codes and two of them is the sendor of crankshaft and the other the rpm srsor but changes the ridiculous sensor which is not original and I do not start either but they check again wanting to abort the pcm fault codes and do not abort them but the new sensor does not send the reference pulse either.
Will the computer have a problem?

Hi Freedman, it would be good for you to put the codes that come out; What would have to know is the type of engine that brings (if it is diesel or gasoline and the year) and if it is magnetic crown in crankshaft, check that it is not in poor condition, for example. that they have folded it when changing the distribution or that the magnetic band is broken and that is why it does not pulse for not inducing. Check is to see. Greetings!