Two (2) Oxygen (O2) sensors for Chevrolet Malibu models 2013-2014 with a 2.4L engine, and for Chevrolet Impala 2014 with a 2.4L engine — Upper + Lower. New, unused. Reason for selling: not compatible with my car. Compatible with: * Buick LaCrosse 2012-2014 with a 2.4L engine * Buick Regal 2011-2014 with a 2.4L engine * Chevrolet Impala 2014 with a 2.4L engine * Chevrolet Malibu 2013-2014 with a 2.4L engine Contents: * Two pieces (2pcs) * Upstream sensor * Downstream sensor Before purchasing, please verify the part's compatibility with your car (make, model, year, engine, especially engine type).