Hi,
That indicated the right rear turn signal bulb is burned out and needs to be replaced. The rapid flash is designed into the system to indicate an open circuit (burned out bulb).
As far as replacing the bulb, it is not difficult to do. If you look at the attachments below, they provide the directions specific to your vehicle for replacement. You will need to remove the taillamp assembly. Once it's removed, you can access the bulbs.
When you look at the pics below, you will see the nuts that hold the assembly on the vehicle. You will need to access them through the trunk.
Let me know if this helps or if you have other questions.
Take care,
Joe
See pics below.
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Sunday, August 1st, 2021 AT 8:30 PM