Suggest to repair at workshop as soon as possible.
1. Check if there is check light or error message in the meter cluster, identify the malfunction item.
2. Turn on the left and right signal separately and determine which side have higher flashing frequency, check the bulb and bulb holder on that particular side will do.
3. Normally prioritise the checking to the turn signal which is not working.
4. Take out the bulb and check if it is fused.
5. If the bulb is normal, use multimeter to check if the wiring is open circuit, short circuit, or poor connection occur to the wiring.
6. Use the scan tool to clear the fault code after repairing done.