Outback F4-2.5L (2008)
Technical Service Bulletin # WVM-23R
Date: 110323
Campaign - ECM Software Update For Catalyst Efficiency
NUMBER: WVM-23
DATE: October 2009 (Revised 03/23/11)
SERVICE PROGRAM BULLETIN
APPLICABILITY:
2006-2009MY CA PZEV Spec. Subaru
Legacy / Outback and 2008-2010MY
CA PZEV Spec. Forester
SUBJECT:
Engine Control Module (ECM)
Reprogramming
INTRODUCTION
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.
AFFECTED VEHICLES
^
2006-2009 MY Subaru Legacy and Outback with CAPZEV Spec Emission System
^
2008-2010 MY Forester with CAPZEV Spec Emission System
^
Affected vehicles are identified in the VIN range chart. NOTE: Prior to performing repairs, confirm coverage for potentially affected vehicles by
using the Vehicle Coverage Inquiry function at the website.
OWNER NOTIFICATION
SOA will prepare and mail an Owner Notification Letter to owners of affected vehicles. Because of the number of vehicles affected~ owner notification
will occur in three (3) phases. Phase one (1) will begin in mid-October. When available, a final schedule for all phases will be posted on the website.
A copy of the Owner Notification Letter is included at the end of this bulletin.
