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![[XD] - P0420 code and O2 Sensor replacement | Hyundai Elantra Forum](https://i2.wp.com/www.elantraxd.com/attachments/20140111_104436-jpg.29426/)
[XD] - P0420 code and O2 Sensor replacement | Hyundai Elantra Forum
P0420 Gm Code
How to clear a P0401 code on a 2006 Honda Civic - YouTube
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GM P0420 Code: Troubleshooting GMC Yukon Denali AWD | JustAnswer
