Subaru WRX 2015–2019 — technical service bulletin
Bulletin 07-146-19R · NHTSA communication 10168585 · issued Nov 6, 2019
Technical service bulletin
communication type
Electrical System
component
2015–2019
model years
5
vehicle entries
Official summary
"This bulletin announces a design change made to the engine wiring harness to improve resistance to moisture. A detailed illustration describing the change is supplied below."
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.