How to shut off security system in a 2002 ford evplorer xlt

The security system the car arrived with is integrated into the vehicle electronics and cannot easily be bypassed, shut off or otherwise overridden.

If the security system is defective, having it repaired is often less trouble and cheaper than getting around it.

I suggest you chat to your local Ford dealer and then ask a local auto locksmith how much cheaper he can repair it for. The alternative would be to remove and send away the engine management ECU to be decoded. In the UK it can take a couple of weeks and cost about £200 for none-trade and it isn't a suitable thing to do for all cars.