I need to check out my cat. I read the best way to wash one was to throw it in the toilet, sit on the lid, and flush, but I am not sure how reliable "Dog" is. I drove to Mom's house and had a CEL when I was leaving her town. My bluetooth reader is in my Civic, which had been showing a code approximately once a month.
I never saw one in the Accord.
Finding somewhere open in sleepy small towns on Sunday took a while. The guy at O'Reilly said both of my catalytic converters were failing, but I failed to get the codes. I keep seeing P0420, but I have not been able to find out how many converters my car has.
I have heard of cats that sound like cans of marbles, ones that simply fall apart, and presumably ones that clog.
There are periodic nagging voices asking why they failed, the new one may fail also. Eric the Car Guy says Hondas and Toyotas do not like aftermarket cats.
This guy had a different method of cleaning it, which did not work:
Mining.com, Hackaday, and Gizmodo each have articles about mining highways, but Cody's Lab tried it:
People kept asking if he was going to keep sweeping the highway.
I asked if he was going to get a job driving a street sweeper.