The front oxygen (air fuel ratio) sensor element may develop a crack, causing the Check Engine Light to illuminate. Subaru has recalled certain models to replace sensors that may fail. The Subaru service program number is WXW-80, this is not a government mandated recall.Google+
Car Problem Reports
Subaru Outback Subaru Front O2 Sensor Recall
Subaru Outback Problem
Average Mileage: 97,039 mi (49,000 mi - 170,000 mi)
Visitor, 2007 Subaru Outback, 54,000 mi
engine light on due to O2 sensor defect and replaced a new sensor at the dealer.
Visitor, 2005 Subaru Outback, 114,713 mi
Changed front sensor twice, light again that sensor has problems
Visitor, 2007 Subaru Outback, 90,000 mi
irregular idle, rotten smell in area of sensor, codes read. not yet fixed,am calling local dealer (suburban Subaru) tomorrow.
Visitor, 2011 Subaru Outback, 49,000 mi
Cost 415.00 at dealer to fix