When the indicator lights flash more quickly than usual, it typically indicates that there is a problem with the turn signal circuit. The faster flashing is caused by the turn signal flasher compensating for a reduced load in the circuit, which can occur if a bulb has burnt out or is not making proper contact.
Since you mentioned that the issue is only on the left-hand side, it is likely that the problem is with a bulb or socket on the left-hand side of the vehicle. Start by checking the left turn signal bulbs to see if any are burnt out or not making proper contact. You can do this by turning on the left turn signal and observing the bulbs to see if any are not lighting up or are flashing at a different rate than the others. If you find a bulb that is not working or flashing at a different rate, try replacing it and see if that resolves the issue.
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