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low efficiency codes

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Old 06-23-2002, 07:20 PM
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Default low efficiency codes
I am throwing these codes in my 2001 trans am.
I am just wondering does this mean i need to replace my cats or that the headers are not making the correct velocity. any ideas?

P0420----system low efficiency bank 1
P0430---system low effidiency bank 2
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Old 06-23-2002, 07:22 PM
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Default Re: low efficiency codes
Just to clarify it's "Catalyst System Low Efficiency"
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Old 06-25-2002, 09:13 AM
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Default Re: low efficiency codes
me too...TTT
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Old 06-25-2002, 09:45 AM
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Default Re: low efficiency codes
These are the back two O2's, both right and left side. Check connection and then try a Reset, O2 check and idle relearn.
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