Subaru Forester 2014–2015 — technical service bulletin
Bulletin WQW-58R · NHTSA communication 10131644 · issued Sep 27, 2016
Technical service bulletin
communication type
Engine and Engine Cooling
component
2014–2015
model years
3
vehicle entries
Official summary
Subaru of America, Inc. has determined that vehicles affected by this Service Program require ECM reprogramming. This bulletin includes the service procedure for diagnosis and repair of customer concerns involving engine idle roughness or, in some cases, engine noise and/or damage resulting from spark knock (pre-ignition). The Engine Control Module logic has also been optimized requiring the ECM reprogramming. The new logic optimizes the ECM for control of the following parameters: * Change to Fuel Cut control when fuel level is extremely low / near empty * Change to improve idle smoothness /
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.