Our keyfob no longer blips the car (Can't afford a replacement either). We have to open the doors using the key. We know have a problem when sometimes we've opened the car got in and it won't start - the immobiliser is on. It will take a few minutes of locking/unlocking the car from inside, actually getting out and locking/unlocking the doors before the immobiliser will allow the car to start. any bright ideas whats wrong ?