When the anti theft system is not working in your 2003 ford ranger the first thing you should try to do is reset it. this can often clear up little software bugs and glitches and get your truck working again. to reset it you will just need a few minutes. the first thing you will need to do is put the key in the ignition cylinder and rotate it to run without starting the engine. after that rotate the key back to the off position. do this eight times in a row and stop on the run position. allow the security light on the dash to blink and then turn off. once the light is off the system has been reset and you can drive off.
The 2003 ford ranger anti theft reset can be done by unlocking the car with the key, and then putting on the ignition.