Catalytic Converters

[22YukonDenali22]

Hey All, hope things are good! I have a 2008 GMC Yukon Denali, bought it with 72k miles on it 4 years ago, and it now has 101k miles. During the 1st 3 years of owning it, I got a p0420 and p0430 code 3 times (once a year). I ran a cat cleaner through it, and it cleared the codes for about a year each time. This month, though, the codes have come on twice, so I'm guessing the cat is finally kicking the bucket. I was just curious if it was normal for these cats to go out before/at 100k miles? Is it possible that it's wonky O2 sensors, or is it more likely the cats?

Thanks for any input!!

 

[Doubeleive]

Hey All, hope things are good! I have a 2008 GMC Yukon Denali, bought it with 72k miles on it 4 years ago, and it now has 101k miles. During the 1st 3 years of owning it, I got a p0420 and p0430 code 3 times (once a year). I ran a cat cleaner through it, and it cleared the codes for about a year each time. This month, though, the codes have come on twice, so I'm guessing the cat is finally kicking the bucket. I was just curious if it was normal for these cats to go out before/at 100k miles? Is it possible that it's wonky O2 sensors, or is it more likely the cats?

Thanks for any input!!

well at 100k it's time to replace all 4 sensors anyway, they may last longer but that is there expected life cycle.
it's a gamble