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- $40.21Automotive-leader 2pcs 234-4390 234-4396 O2 Oxygen Sensor 1 Sensor 2 Upstream Downstream for 2004-2005 Mazda 3 2.0L-L4 Canada and Exc Calif. 2004-2005 Mazda 3 2.3L-L4 2006-2007 Mazda 5 2.3L-L4Amazon