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SES light code P0420...wat should I do?

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Old 05-15-2005, 04:46 PM
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SES light code P0420...wat should I do?
It says catalyst Efficiency Below Threshold (bank 1) first off what does this mean exactly?? and what should i do about it??

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Old 05-15-2005, 06:24 PM
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http://forums.maxima.org/showthread.php?t=374481

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Old 05-15-2005, 06:28 PM
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