Usually a fast flashing signal is because one of the bulbs is burned out or shorted out. If the signal and brakes use the same light which many cars do then check the wiring to it and replace bulb. If burns out again then it has a short between the signal switch and the actual light or the brake wiring to it is shorted.
There is a bulb on the left side that is burned out.The fast turn signal flash is what occurs when the filament burns out. Turn on the left side and see which one is flashing front or rear and compare to right side.
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