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Old 12-08-2018, 07:36 PM   #1
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Expected Code P0420

After doing all 3 mounts I got a intermittent exhaust leak. I was expecting a code but none came for a few weeks. The other day it seemed worse than normal and poof P0420. I'll check back later when I get around to fixing it. Still early in my emissions so my only motivation is the annoying light and creating non ideal conditions for the cat I have no interest in replacing.



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Old 12-09-2018, 08:25 AM   #2
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That code doesnt always mean bad CAT , Could be just a bad rear o2 sensor as well

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Old 12-09-2018, 01:07 PM   #3
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Cats only go bad with bad fuel or too many short trips too often. I go 40 mins twice a day 4 days a week and drive hard so my Cat will last forever unless it gets physically damaged or the honeycomb gets a stress break and fails. I'll never have a clogged CAT. The one Escort zx2 I had a Cat issue on I even replaced it. I think it turned out to be something else I don't even remember.
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Old 12-12-2018, 10:14 AM   #4
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Haven't heard the Obvious Leak for a day or 2. Engine light was off this morning having done nothing. If it doesn't come back I may just try going a hair tighter on the exhaust bolts when the car is in the air again.
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Old 12-13-2018, 12:57 PM   #5
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CATS go bad for many reasons , I have seen many CATS changed with less then 15,000 on the car and many more at 30,000 and so on

How you drive doesnt really effect how long the CAT last

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Old 12-19-2018, 11:54 AM   #6
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Originally Posted by 1turbofocus View Post
CATS go bad for many reasons , I have seen many CATS changed with less then 15,000 on the car and many more at 30,000 and so on

How you drive doesnt really effect how long the CAT last

Tom
I find that unlikely. Same CAT for 60k while I've owned it and I'm pretty sure it is Original for the whole 154k on it now. I am 100% sure CAT failure is a symptom of bad fuel and or short drive styles. I'm sure there are other types but I think I remember. The one time I did replace a CAT on an Escort zx2 I think I fixed it by replacing a melted vacuum line...

Found my leak. Not sure why I got a code since it is at the end of the Flex section which is behind the O2 sensor. The Flex pulled out of the pipe. anyone know of an easy fix without pulling the CAT out...
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Old 12-19-2018, 07:04 PM   #7
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He's got ya there Bud, there are a lot more reasons a cat can go bad.
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Old 12-19-2018, 07:55 PM   #8
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He's got ya there Bud, there are a lot more reasons a cat can go bad.
Yes many.

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Old 01-02-2019, 02:01 PM   #9
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Leak/break is still at the rear end of the flex. It seems to be as quite as usual and no Code. I wonder if it breaking there actually fixed the loud leak possibly at the front of the flex by taking tension off the connection.
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Old 04-05-2019, 12:22 AM   #10
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P0420 Recomend cheap flex fix?

Update. Flex has 3 layers. Top 2 broke at the rear of the flex and the innermost layer broke at the top. I couldn't figure why it would throw a code when the leak was behind the o2 sensor so I probably imagined a header exhaust gasket leak and in the process of pulling the engine forward undoing the passenger and torque Mount I finished off the flex so I have a straight pipe under the car that gasses us if the AC is on or windows down when stopped... Can I buy the right length and size flex and just clamp it or does that work for shit?
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