Subaru WRX 2015–2017 — technical service bulletin
Bulletin 1117117 · NHTSA communication 10131692 · issued Feb 23, 2017
Technical service bulletin
communication type
Electrical System
component
2015–2017
model years
3
vehicle entries
Official summary
This bulletin announces the availability of reprogramming files to optimize the ECM and address isolated customer concerns of a spark knock (engine ping) -type sound.
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.