Subaru Legacy 2015–2018 — technical service bulletin
Bulletin 02-171-18R · NHTSA communication 10143727 · issued Jul 26, 2018
Technical service bulletin
communication type
Engine
component
2015–2018
model years
8
vehicle entries
Official summary
This bulletin provides a service procedure for installation of additional foam packing to enhance performance of the Ambient Air Temperature Sensor. The additional foam better insulates the sensor from engine compartment heat which may lead to setting a DTC P0072. This information is applicable to models with or without the Active Grill Shutter (AGS) system.
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.