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The key does have a transponder in it, but the anti-theft or security light will flash or illuminate if the transponder is bad. If that is not happening, I question the ignition switch itself since you mentioned it catches at times. First, the ignition switch is not part of the cylinder where the key goes. It is an electrical device located in the steering column. There is a shaft which is moved when you turn the key which engages it. I hate to suggest this and be wrong, but you may want to inspect it to determine if something is loose and not allowing the shaft to properly engage the switch.
Here are directions for removal and replacement of the switch. I am not saying to replace it, but the directions show how to access it and work on it. The attached pictures correlate with these directions.
IGNITION SWITCH REMOVAL
The ignition switch attaches to the lock cylinder housing on the end opposite the lock cylinder.
1. Disconnect negative cable from battery.
2. Place key cylinder in RUN position. Through the hole in the lower shroud, depress lock cylinder retaining tab and remove key cylinder.
3. Remove upper and lower shrouds from steering column.
4. Disconnect electrical connectors from ignition switch.
5. Remove ignition switch mounting screw with a #10 Torx bit.
6. Depress retaining tabs and pull ignition switch from steering column.
1. Ensure the ignition switch is in the RUN position and the actuator shaft in the lock housing is in the RUN position.
2. Carefully install the ignition switch. The switch will snap over the retaining tabs. Install mounting screw.
3. Install electrical connectors to ignition switch.
4. Install upper and lower shrouds.
5. Install key cylinder (cylinder retaining tab will depress only in the RUN position).
6. Connect negative cable to battery.
7. Check for proper operation of ignition switch and key-in warning switch.
I hope this helps. Let me know your thoughts or questions.
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Thursday, April 15th, 2021 AT 6:53 PM