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P0420 after seafom/new 02

 
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Old 09-20-2011, 08:44 AM
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P0420 after seafom/new 02

Had my primary 02 sensor go out so I ordered a new denso one.
before pulling it out decided to do some seafoam. ( had a decent amount of smoke come out) Car runs great, way better than before after the seafoam and new oxygen sensor.

After 1 day of driving..100miles maybe or less I had a CEL light come on (P0420)

I still have not checked/replaced the second 02 sensor...

any ideas on if its a for sure cat or maybe a fluke? I am not having any issues with the car at all.

If all comes to worse and its cat can I use a base cat or do I have to get a SH specific one?
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Old 09-20-2011, 09:38 AM
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Re: P0420 after seafom/new 02

Could just be related to seafoaming it, I'd reset the ecu and see if it comes back in a few drive cycles.
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Old 09-20-2011, 12:59 PM
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Re: P0420 after seafom/new 02

P0420 Catalyst System Efficiency Below Threshold

maybe you purchased a faulty 02 sensor. OR that your cat truly is on its way out.
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Old 09-20-2011, 06:54 PM
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Re: P0420 after seafom/new 02

You just flooded your cat with shiz thats been sitting around for ages. I don't see it as farfetched for the cat to be clogged...
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Old 09-20-2011, 10:28 PM
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Re: P0420 after seafom/new 02

Cat is bad. Get a new one.
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Old 09-21-2011, 01:52 AM
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Re: P0420 after seafom/new 02

Definitely just the catalytic converter. When **** builds up in your engine and you burn it all out your cat with get clogged. Just like when you clean a dirty fuel system or start running E85, you'll usually benefit from a new fuel filter! Good luck.
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Old 09-21-2011, 07:30 AM
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Re: P0420 after seafom/new 02

I'm running a gallon of thinner in half tank of gas supposed to clean a cat I'll let you know what happens. I've seen some positive reviews and got nothing to loose.
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Old 09-21-2011, 03:53 PM
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Re: P0420 after seafom/new 02

I heard bleach cleans a cat very good with no effects to the material inside of it. Need to rinse with distilled/dionized water.
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Old 09-22-2011, 10:17 AM
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Re: P0420 after seafom/new 02

bore out the cat, put the 02 sensor into a de-fouler plug then put that into ur cat, bolt up everything clear the code an u wont have to worry anymore
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Old 09-22-2011, 08:52 PM
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Re: P0420 after seafom/new 02

not really sure about that one I have a hi flow cat and a new secondary 02 and the light always came back on. That is why im back to a real cat again.
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Old 09-22-2011, 10:37 PM
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Re: P0420 after seafom/new 02

knock out the inside of the old cat, or if u want jus put on the de fouler on the cat clear the code an u shudnt have a check engine light anymore
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Old 09-23-2011, 03:00 AM
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Re: P0420 after seafom/new 02

If you do buy another cat, you it'll be easier to get the SH specific one if you have an SH. To my knowledge, the SH one is a bit longer.
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Old 09-23-2011, 04:02 AM
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Re: P0420 after seafom/new 02

SH cat is longer.
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