When you say "the immobilizer will not go off" that mean you can still drive the car or not,when the immobilizer goes on you can start the car but will not run, so what do you need a spear key for .you may need the valet key, is a gray key . I am professional car alarm and remote start installer so I deal with this kind of problems if you have any question email me firstname.lastname@example.org
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you may have dropped the RFID chip inside the battery housing. That chip is used by the immobilizer to recognize the key. Get your spare key and use it to start. If you don't have one, you will need to get your key replaced and reprogrammed.
The 'immobilizer' is an integral part of the engine computer and cannot be disarmed. It can, however, be tricked. There is a device used on cars with this system that tricks the computer to think the key is there during remote start. The bypass module, as it is called, learns the transponder code from the key (more advanced models) or just uses a spare key with a transponder in it to trick the engine computer. This requires you to have the key to the vehicle. If you don't have the key, the only option is to get a dealer to cut you one based on your VIN number. You'll have to provide proof of ownership. They do it this way because just anyone could get a VIN number from a parking lot and have a key made if they didn't require proof of ownership.
Now, you didn't give any information about what model car you have and the year, so I can't give you more detailed information on what type of immobilizer system the car has and different ways, if any, that it can be tricked. Keep this in mind when you rate.
The immobilizer feature was tripped when the alarm went off. It sounds like the battery was indeed dead. My Nissan 300ZX used to trip the alarm when I jump-started it, although my Audi A4 does not. When the alarm is going off, you have to disarm it with the key or key fob first, or you won't be able to start it. Try putting the key in the door, lock it, unlock it, lock it again, and unlock it again, just to make sure you get a couple of arm/disarm cycles, then try starting it.