07-03-2014, 05:20 PM
I'm guessing that the new fob is for the older IR (Phase 2) setup whereas yours is the newer RF (Phase 3) setup.
1990 Peugeot 205 GTi 1.9 // 1991 Peugeot 205 GTi 1.9 16v // 1992 Peugeot 205 GTi 1.9 // 1999 Peugeot 306 HDi Estate