My truck has 243k miles and is still on the original cats. How have yours faired?
Most miles you had on a catalytic converter?
- Thread starter boom10ful
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Volvo 242T over 300,000 
I have never replaced a cat . May have been instances when I might have needed to ?
I don't ever recall needing to replace one.
Cats don't really wear out. They get killed by oil/coolant/fuel contamination.
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277k on our 02 Camry when we traded it.
It would pop the P0420 code every so often, then it would go away. No testing in my locale.
Over 245K on my 1995 Escort and still going!
All of the vehicles in my sig have the original converters, but the BMW is OBDI so I really don't know if those are working or not. I've seen inside them and they are still intact and haven't overheated or anything, so I'm guessing they are.
Nearing 120k on my Peugeot 106, original cat from 1999
Nick1994
$100 site donor 2023
227k on my Camry's cat.
I had the one on my Jeep replaced last year, it was broken inside and rattling around. It was dented on the bottom so I bottomed it out off-road at some point that probably broke it.
Least Miles: 70,000 on a 2002 F-150. The factory cat rusted and leaked fumes into the cab last winter, it was "fun" 
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Whimsey
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Whimsey
350 k on a 528e
Our 96 Tacoma shop truck has 425k on it. Still passes the California emissions test.
I saw a video on YouTube from Scotty Kilmer and he washed a catalytic converter with soap an water.
Is this effective at prolonging the life of converter ?
My '88 Accord still passed the treadmill emissions test by a wide margin at 20 y.o. and 220K miles, before I sold it.
2004 Honda Accord EX V6, 246K on it when we traded it in and still on OEM Cats
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