Subaru Legacy 2020–2021 — technical service bulletin
Bulletin Subarunet Announ · NHTSA communication 10186306 · issued Jan 5, 2021
Technical service bulletin
communication type
Equipment
component
2020–2021
model years
4
vehicle entries
Official summary
Campaigns WRH-20 and WRI-20 related to a Denso Gen 4 CP1 software update. Critical points to avoiding unnecessary hardware replacement.
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.