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Anti-Lock Brake systems generally do a self-test as soon as the key is turned to the ON position, whether or not you start the engine. This usually only takes a second or so and creates a series of buzzes and clicks under the hood that can be heard from inside the vehicle. Most vehicles also have many electromechanical relays that will be energized when the key is turned ON, which will also create audible clicking sounds. On fuel-injected vehicles, you will generally also hear a buzzing noise from the fuel tank for a second or two while the fuel pump is priming.

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