Subaru Impreza 2008 — technical service bulletin
Bulletin WVE-15 · NHTSA communication 10027464 · issued Aug 1, 2008
Technical service bulletin
communication type
Engine and Engine Cooling
component
2008
model years
1
vehicle entries
Official summary
Subaru vehicle service campaign: see document search button for owner letter. Engine control module reprogramming. Under certain harsh driving patterns, specifically when repeatedly or continuously operating the engine above the red line (rpm above 6,700), abnormal combustion could occur resulting in serious internal engine damage in the form of broken piston ring lands. (impreza wrx sti models) csc letter was received. *pe
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.