234-4550 (4-Wire Oxygen Sensor) Downstream. Forte 2.0L L4 2014 2015 2016 2017 2018（Federal Emissions）. Forte Koup 2.0L L4 2014 2015 2016（Federal Emissions）. Elantra 1.8L L4 2011 2012 2013（Federal Emissions）.
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