Can anyone suggest a starting point to diagnose a 2006 Prius that flashes both tail lights rather than one whenever a turn signal is engaged? Is a broken emergency flasher pushbutton a good first guess? Thanks in advance for any recommendation.
I recommend first that you have a moderator delete this thread and stick to just one thread asking this question. Otherwise it's going to generate a ton of confusion with two separate conversations going on.
Has the vehicle experienced any damage? Maybe the wiring harness got damage and wires got crossed? And yes, unplug hazard plug and see if that changes anything?