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P0420 code

This is a discussion on P0420 code within the External Engine forums, part of the LSx Technical Help Section category; SES light popped up the beginning of August. P0420, Bank 1. I cleaned my MAF and replaced my K&N with ...

  1. #1
    She Moderator KahanaReef's Avatar
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    Question P0420 code

    SES light popped up the beginning of August. P0420, Bank 1.

    I cleaned my MAF and replaced my K&N with a WIX paper filter.

    I figured I'd just have to suck it up and replace the cat. I missed the extended warranty by 6 months

    The SES light stayed on for about 20 more miles or so after I did the MAF and filter change. But, now it's gone. And, it's been gone for a few weeks now.

    Coincidence?

    Thoughts?

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    Life in the Fast lane sunsetorangess's Avatar
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    Took a few drive cycle's for the computer to find its happy place. Your maf was probly covered in oil from the K&N filter.
    J
    2001 SS, Its not the car its the Driver that matters....

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    She Moderator KahanaReef's Avatar
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    Quote Originally Posted by sunsetorangess View Post
    Took a few drive cycle's for the computer to find its happy place. Your maf was probly covered in oil from the K&N filter.
    J
    I read that somewhere and is why I changed the filter to paper and cleaned the MAF.

    But, then I read that it wouldn't 'fix' the problem and that the only cause for the P0420 code is the converters and that they would have to be replaced.

    So, am I good to go then? No need to worry about the cats?

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    Life in the Fast lane sunsetorangess's Avatar
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    Only time will tell but i can tell you from experiance K&N filters are garbage and cause tons of problems without any gains or justifible protection. I have seen the code along with a few others because of a dirty maf. Normaly when your cat starts to plug up you get a foul odor and loss of power with the codes, even a rough idle.
    J

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    She Moderator KahanaReef's Avatar
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    Well, I'll just keep my fingers crossed then and stick with the paper filters.

    Thank you

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    Life in the Fast lane sunsetorangess's Avatar
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    Anytime, Let me know if ya need some cats, i think i have a set in the shed with a few thousand miles on them.
    J

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    Moderator 35th-ANV-SS's Avatar
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    Just ditch the cats lady!!!

























    Oh wait...you live in Cali

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    She Moderator KahanaReef's Avatar
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    Quote Originally Posted by sunsetorangess View Post
    Anytime, Let me know if ya need some cats, i think i have a set in the shed with a few thousand miles on them.
    J
    Will they conform to the strict laws of Communist California?

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    She Moderator KahanaReef's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    Just ditch the cats lady!!!





    Oh wait...you live in Cali
    Beat me to it

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