The 206 has had eight different motorizations and with no less than ten motor management systems of different characteristics, impossible to help you if you do not give precise engine data and injection system.
Motors:
Tu, TU3, TU3J, TU5JP4, DW8, DW8B, EW10J4, HDI 2.0 90CV.
Injection systems:
Marelli, Siemens, Bosch, Continental, Valeo, etc. and all brands with different schemes.