Technical Service Bulletin WVM23R — 2009 SUBARU LEGACY

REVISED. CA PZEV SPEC MODELS ONLY. Subaru of America, Inc. (SOA) has determined that vehicles affected by this Service Program require ECM reprogramming. Under certain severe driving patterns, such as high speed highway/uphill driving and/or accelerating with high engine revolutions, the efficiency of an affected vehicle?s catalytic converter may begin to degrade beyond design parameters. (The ?Check Engine? light will illuminate to alert the driver if the catalytic converter efficiency has degraded beyond an acceptable level and if the vehicle may be releasing air pollutants that exceed Federal or California emission standards.) To prevent this condition, a modification to the Engine Control Module software logic has been developed that will improve management of the catalytic converter. This condition is a software issue and has no impact on vehicle drivability.