This Service Information Bulletin announces diagnostic service procedures to be followed when DTC P0420...
Subaru technical service bulletin 09-110-23R for 2017-2023 Subaru Outback, 2017-2023 Subaru Forester and 2017-2023 Subaru Legacy and others.
- Bulletin number
- 09-110-23R
- Component
- Engine and engine cooling
- Summary
- This Service Information Bulletin announces diagnostic service procedures to be followed when DTC P0420 (Catalyst System Efficiency Below Threshold Bank 1) is detected by the Engine Control Module (ECM).
Owners of these vehicles have filed 868 complaints in the engine category.
Vehicles covered
- Subaru Outback 2017-2023 2017201820192020202120222023
- Subaru Forester 2017-2023 2017201820192020202120222023
- Subaru Legacy 2017-2023 2017201820192020202120222023
- Subaru Impreza 2017-2023 2017201820192020202120222023
- Subaru Crosstrek 2017-2023 2017201820192020202120222023
- Subaru Ascent 2019-2021 201920202021
- Subaru WRX 2018-2023 201820192020202120222023
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