Catalist efficiency below threshold


#1

I was app. 10 miles from home & engine started missing & went into limp mode & yes the light flashed . I limped it home anyway & now have a PO430 code . # 2 spark plug died & caused this , danged plug didn’t have a hundred miles on it since new . Replaced that plug & everything’s fine except that code . Vehicle runs great . Anyone think cataclean or a similar product is worth a try ? I’ve also read an 02 sensor could cause this code .


#2

It may take x amount of miles and or starts for the code to clear. Both are possible, no personal experience with cleaners for the cat.


#3

The flashing Check Engine light was reporting that if you continued to drive the vehicle, there was a possibility that the catalytic converter could be damaged. And if the substrate of the catalytic converter is cracked it reduces the catalyst efficiency.

Some will say replace the down-stream O2sensor. But this is like killing the messenger because you don’t like the news.

Tester


#4

Some people swear by those catalytic converter cleaners in a bottle, others swear at them. Probably won’t hurt. As @Barkydog wrote, the code will continue until a certain number of “drive cycles” occur. You could clear the code with an OBD II reader and see if it returns.


#5

There are a couple brands that get pretty good reviews . Think I’ll try one . I did clear the code & it came back .