Immobiliser will not disable with code Disable rover 400 immobilizer?

If your battery has been disconnected and your key fob will now not work to cancel the imobiliser try this, Open the key fob cover and carefully remove the larger of the two battries give it a wipe for good measure and then replace into its slot, go and sit in your car with doors closed and then press the open and close buttons alternately about four times, the doors will lock just press the open button and your imobiliser is imobilized and you can now start your car. It works for me every time.