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The ignition lock cylinder on your Ford F-Series is the tumbler and key used to start your truck. The ignition lock cylinder activates the ignition switch to power the fuel pump, accessory circuit, and to start your engine. With time and age, the ignition lock cylinder can wear down or start to stick, and may need to be replaced. If your Ford F-Series is having difficulty starting, or if the key gets stuck in the ignition, the lock cylinder may be failing. If your Ford truck needs a replacement ignition lock cylinder, O'Reilly has ignition cylinders, ignition switches, and more for a complete repair.