This indicates the catalytic convertor isn't working at correct values , this may be due to a leak in the air intake system or the exhaust system before the cat convertor , if no leaks found i'd recommend a fuel addative that cleans the catalytic convertor as well as the engine parts , take for a longish drive (50-100) at a highish speed to get to a high engine temperature , may have to do this a couple of times and rescan for code , if still showing code will need further investigation as to which sensor may need replacing
The Misleading Nature of the PO42O Code http://www.easterncatalytic.com/education/tech-tips/the-misleading-nature-of-the-po42o-code/
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