I've got a P0420-00 State: Intermittent
Catalyst system efficiency below threshold (bank 1)
With my car being 2017 and 23,000miles... It seems quite low mileage for a cat failure, yet I have seen another post on this forum with someone having something similar happen and needing the cat to be replaced.
There's no indication of an o2 sensor fault there so not much I can do about it right?!
