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Registered
Join Date: Jul 2006
Posts: 10
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More CEL codes
I have a 1997 328IC and recently had CEL come on (again). The code was P0420 and the description was "bank 1 catalyst below threshold". Anyone know what this means? I just got two O2 sensors but did not install yet. Which pipe is bank 1? Has anyone else had this problem and resolved it?
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04-11-2007, 05:23 PM
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