My 2013 FR-S (73k miles; manual transmission) just threw this code for the very first time. I came across another thread on here (
https://www.ft86club.com/forums/show...gen)%20sensors.) that discusses the issue but there was no resolution.
If you have dealt with this issue, was the converter the culprit or an O2 sensor? If the former, was "cleaning" it using one of those gas treatments helpful or did you simply have to replace it? Any thoughts on cost? (I'm in SoCal.)