I could use the assistance of the hive mind here with some codes after a CEL popped up. I had posted a question back in late February/early March with a CEL that turned out to be a flex pipe issue. Local muffler shop fixed the pipes, the CEL disappeared as did the VROOM VROOM sound sound that came with acceleration. No performance issues with the car since then. The help from the group was incredibly informative both on the diagnostic side and with price quotes from shops.
Two weeks ago, the CEL came on again. No performance issues or noises coming from the car this time around. I did notice that after parking and killing engine, there is a faint exhaust-type smell though. I took the car to my local Advance Auto Parts and had them hook the car up to their computer for a diagnostic. Two codes came up.
#1: P0431, warm-up catalyst efficiency bank 2 below threshold pending
#2: P0431, warm-up catalyst efficiency bank 2 below threshold confirmed
The AAP employee didn’t have anything to add to the code readouts. I’m concerned that this is a catalytic converter issue, and if that’s the case, a repair would likely cost more than I’m willing to put into the car at this point. It has just over 125K miles on it and not due for emissions inspections until October. I have not taken it into a shop yet, hoping to get some knowledge here before doing so. Any insight into the codes? And what action to take with bringing to a shop in terms of repairs and estimates? As always, all thoughts and comments welcome. If more information is needed on the car itself, please let me know.