【Warranty】2 Years. (Improve fuel efficiency & Stable performance & Durable) 【Placement on Vehicle】▲234-9097 Upstream, Front, Pre-cat ; 234-4445 Downstream, Rear, Post-cat ▲Sensor Type : Heated ▲Wire Count : 4-Wire ▲234-9097 Wiring Harness Length : 19.88 IN▲234-4445 Wire Harness Length : 20.87 IN 【Direct Fit Application】234-9097 upstream o2 sensor + 234-4445 downstream o2 sensor replacement for Subaru Legacy H4 2.5L 2010 2011 2012, for Subaru Outback H4 2.5L 2010 2011 2012 【Interchange Part Number】234-9097, 2349097, 18066, 24831, 22641-AA540, 22641-AA54A, 18066, 24831, 250-54067, OS5597; 234-4445, 2344445, 22690-AA810, 22690AA810, 22690-AA81A, 32010413, 213-2951, 15170, 15172, 24642, OS5331 【Service Guaranteed】Must pass a rigorous professional practice loading test before sale and shipment. 1 0 0 % satisfaction after sale services and technical assistance. Please rest assured to purchase.If you have any questions, contact with us, we will reply you in 24 hours and offer the solve way for you.Hope you have a good shopping! 【Direct Fit Application】234-9097 upstream o2 sensor + 234-4445 downstream o2 sensor replacement for Subaru Legacy H4 2.5L 2010 2011 2012, for Subaru Outback H4 2.5L 2010 2011 2012