I've just replaced the engine in my Forester, everything works okay and it's passed its MOT today but the central locking / alarm is acting up. Before the engine replacement, when I pressed the key remote once the drivers door would unlock, press the key twice and all the doors would unlock. When I came to lock the car I would get out and press the key once and the car would lock all the doors.
Now when I press the key remote once the car alarm system bleeps for around 25 times then the alarm goes off, I press the key remote while the alarm is bleeping and the drivers door unlocks, press it twice and all the doors unlock. When I get out I press the key remote and again the alarm starts to bleep, press the key remote again and all the doors apart from the drivers door lock. If I allow the alarm to go off then press the key remote then all the doors lock.
Can anyone out there explain how I can correct this please, I've tried different ways and sequences of pressing the key remote but without success.