I have an R reg vectra and my problems started yesterday when the electronic engine alert symbol kept coming on and every time I stopped at lights etc the car stalled. I was going to take it to a garage today but neither of my remote key fobs would unlock the doors. Batteries are fine. So I opened the door manually and the alarm went off. I tried putting the key in the ignition but everything is dead. I can't turn the alarm off because the key fobs no longer unlock the door and I guess the immobiliser is activated because the car is completely dead when I put in the key in. Please what can I do?