So my 2006 pathfinder was stalling in the middle of driving last week. I read about the ECM relay recall and took it to the dealer and they replaced the relay. After that it seemed to drive well and hasn't stalled. However a week later the service engine soon light came on. I checked the error code and it is returning P0420 Catalyst System Efficiency Below Threshold (Bank 1) and the P0430 code.
It seems really interesting this happened after less than 30 miles of driving after the ECM relay was replaced.
I'm not much of a mechanic but I want to be informed and hopefully not have to spend money on replacing the catalytic convertors. Is it just a coincidence that this code would come on a few days after replacing the ECM relay, or are they connected. What could be the issues? Thanks.