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Why does the tail light blink fast on a 2000 Buick LeSabre?

The tail light on a 2000 Buick LeSabre blinks fast when there is a problem with the turn signal circuit. This could be due to a faulty turn signal switch, a bad flasher relay, or a problem with the wiring. To diagnose the problem, you will need to check the turn signal switch, the flasher relay, and the wiring.