Thread: OBD Code O420 Help

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  1. #1 OBD Code O420 Help 
    BeachVette6
    BeachVette6 is offline
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    Default 08-07-2014
    Hi, Can a 0420 code be caused by a defective downstream O2 sensor?
    Last edited by BeachVette6; 08-07-2014 at 10:49 PM.
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