If you need to reset the anti theft system on a ford f150 you should : step 1 insert your first programmed key into the car's ignition and turn it to the "on" position. Step 2 cycle the first key back "off," remove it from the ignition and insert the second programmed key within 5 seconds. Step 3 cycle in "on" and "off" and then remove the
1 Answer. It is low battery voltage. It's a common problem with late model falcons, being more demanding on battery voltage. The original batteries were only warranted for 12 months and were not really up to the task. Your best solution is replace it with a good quality higher capacity battery, around the 600CCA range. What the immobilizer warning light means. The indicator for the immobilizers behave similarly between different vehicles, but refer to the owner’s manual for specific information on your vehicle’s system. Generally, when you first start the engine, this light will illuminate for a few seconds showing that the correct key has been used. Turn the ignition to the off position and remove the second coded key from the ignition. After three seconds and before 20 seconds, insert the new uncoded key into the ignition. Turn the ignition to the on position and keep it on for at least 6 seconds. Remove the newly coded key from the ignition. High School or GED. 25,937 satisfied customers. Ford XR6 Turbo: Ford XR6 turbo 4.0 Litre When changing down. Ford XR6 turbo 4.0 Litre When changing down from 5th to 4th gear (3-4,000 Revs)car begins to shudder and temperarily loses power … read more. FFvMaI.