Thread: p0420 Catalyst System Efficiency Below Threshold (Bank 1)

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  1. #1 p0420 Catalyst System Efficiency Below Threshold (Bank 1) 
    Donating Users NaturallySmashed's Avatar
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    Just figured I'd make a post to see what you guys think.. I believe this code is usually for a bad catalytic converter.. I have no way to test it. Should I just change the o2 sensor first? Also, would that be the o2 after the cat?
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  2. #2 Re: p0420 Catalyst System Efficiency Below Threshold (Bank 1) 
    Turbo is the way to go. BillBoost37's Avatar
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    The code tells you that the difference in readings before and after the cat do not have the necessary amount of change as expected by the pcm with a good functioning cat.

    The sensors are seemingly reading ok. There shouldn't be a need to change a sensor.
    I drink..so consider that when reading my posts.

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  3. #3 Re: p0420 Catalyst System Efficiency Below Threshold (Bank 1) 
    Donating Users NaturallySmashed's Avatar
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    Thought so.. ugh. Thanks
    Last edited by NaturallySmashed; 08-13-2009 at 01:19 AM.
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