# Service bulletin WVM23R

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10131701
- Published by NHTSA: 2018\-04\-02
- Manufacturer's number: WVM23R
- Manufacturer's date: 2017\-02\-06
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2017/MC-10131701-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2017/MC-10131701-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine

## Vehicles listed

- 2008 to 2010 SUBARU FORESTER
- 2006 to 2009 SUBARU LEGACY
- 2006 to 2009 SUBARU OUTBACK

## Recalls for the same vehicles and component

- [08V460000](/recalls/nhtsa/08V460000.md), 2008-09-11: ENGINE AND ENGINE COOLING:ENGINE
- [2008333](/recalls/tc/2008333.md), 2008-09-09: Engine

## Other bulletins for the same vehicles and component

- [15\-300\-22R](/bulletins/11027982.md), 2026-02-02, Service bulletin: ELECTRICAL SYSTEM; ENGINE. This Bulletin provides the diagnostic procedure for the STARLINK® Remote Engine Start \(RES\).
- [18\-226\-25R](/bulletins/11027083.md), 2026-01-06, Service bulletin: ELECTRICAL SYSTEM; ENGINE. This Service Information Bulletin provides the Service Manual Correction to the diagnostic procedure for DTC B2A16 \(Immobilizer Key Collation Diagnosis\).
- [Subaru Service Technical](/bulletins/11022305.md), 2025-09-02, Other: ENGINE; ELECTRICAL SYSTEM; POWER TRAIN. Subaru Service Technical Support Newsletter special edition.
- [02\-192\-24R](/bulletins/11017452.md), 2025-05-01, Service bulletin: ENGINE. This Bulletin announces the diagnostic procedures to be followed when diagnosing engine oil leakage on FA and FB type engines.
- [09\-51\-08R](/bulletins/11016224.md), 2025-04-01, Service bulletin: ENGINE. The purpose of this bulletin is to advise of SOA’s revised Catalytic Converter Recycling Program shipping procedure.
- [01\-167\-08R](/bulletins/11008282.md), 2024-10-02, Service bulletin: ENGINE; ELECTRICAL SYSTEM. This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.
- [02\-192\-24](/bulletins/11008281.md), 2024-10-02, Service bulletin: ENGINE. This Service Information Bulletin announces the diagnostic procedures to be followed when diagnosing engine oil leakage on FA and FB type engines.
- [02\-191\-22R](/bulletins/11008267.md), 2024-10-02, Service bulletin: ENGINE. This bulletin announces availability of the NEW genuine Subaru engine oil filter.
- [01\-168\-09R](/bulletins/11006934.md), 2024-09-04, Service bulletin: ELECTRICAL SYSTEM; ENGINE. The purpose of this bulletin is to provide replacement key and immobilizer information along with an overview of the Subaru Lock Information web\-site.
- [Thermo Control Valve Vide](/bulletins/11005608.md), 2024-08-05, Other: ENGINE. This thermo control valve video contains information on the replacement of thermo control valve.

JSON: [/v1/bulletins/10131701](/v1/bulletins/10131701)

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