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New Cats and O2's... Still giving P0420 code

This is a discussion on New Cats and O2's... Still giving P0420 code within the External Engine forums, part of the LSx Technical Help Section category; A few months ago, I replace my cats and O2 sensors with Magnaflows and Denso Sensors. Randomly, a couple of ...

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    Unhappy New Cats and O2's... Still giving P0420 code

    A few months ago, I replace my cats and O2 sensors with Magnaflows and Denso Sensors. Randomly, a couple of weeks ago I had a misfire code due to a bad no7 plug. Got that fixed. Now I am getting the Catalyst code for bank 1. Did I buy some bad sensors or bad cats? Or is it something else that I could be missing? I reset the code and it still came back. I really don't want to have to buy and put new ones on again... last time I did that while it was snowing...

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    Veteran 0rion's Avatar
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    one way to rule out a sensor is to swap them side to side and see if it starts throwing p0430.

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    Member importhater81's Avatar
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    The misfire on #7 could have damaged the cat on bank 1,especially if that cylinder was dumping raw fuel into the exhaust.


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