I have a 2006 Lexus LX 470 and I’m getting the check engine light on. I have a reader and I am seeing P0430 “ catalyst efficiency below normal (bank 2). I took some data from the sensors and plotted it but didn’t really understand it that well. Was wondering if anyone could tell me if this reflects a bad catalytic converters or not. Not sure why the downstream sensor voltages would be different. My understanding was that the downstream sensor traces would be oscillating like the upstream of the cat was bad though. Thanks for any help.
EDIT (adding catylytic converter temperature plot): Note: T0 on this plot is not the same as T0 on the top plot. This was taken after that data set. Sorry the plotting software ran the graphs together.