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Po-420

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Old 03-30-2008, 09:21 PM
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My 2000 firebird has been throwing a code that reads PO420 (Catalyst balance below threshhold) I think its the cat does that sound right?
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Old 03-31-2008, 09:21 AM
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Yeah P0420 is usually the cat, drivers side. Lots of posts here on it if you look for P0420. GM extended the warranty on them to 10yrs/120K for the 00-02 F cars.
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