JohnKos Posted January 23, 2010 Share Posted January 23, 2010 Light came on so i went to Autozone for a reading. Code came back P0420, catalyst efficiency below threshold - bank 1 possible causes: 1. rich a/f ratio 2. ignition system malfunction 3. faulty catalytic converter. Is there anything i can check or do before i take it to the shop for their opinion? Link to comment Share on other sites More sharing options...
JohnKos Posted January 23, 2010 Author Share Posted January 23, 2010 Crap, put this in older cars instead of newer. It's a 1997 legacy. i'll repost it there. Link to comment Share on other sites More sharing options...
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