P0420 Worth replacing catalytic converter a 2nd time? 297k

The only concern I would have is that if the light is on all the time, you won't be able to know if some other fault occurs.

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Mine has been on for 2 years I still have the original cat in this '09 that I'm driving and it's been throwing this code but I have not changed both sensors with a decent set of the proper numbers in the right place when I first got the car the light was not on and the guy said he had never seen the light. And he drove this car all the $200,000 miles except 15 of it. So I'm going to try the sensors first and see if that cleans the mess up I really have trouble believing that there would be different amounts of flow rates in these converters versus another two z converter like in a Corolla but I know they're heating problems and other things so we will see

 

A sulphur smell is likely caused by the fuel mixture being too rich (too much fuel)- that causes the cat to spit out sulphur dioxide along with other "bad" gases.

I would be testing the A/F and O2 sensors.

Normal exhaust- even with a dead cat- doesn't smell like much of anything (unless your engine burns a lot of oil).

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