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SUBARU

09-110-23

Manufacturer communications

Publication date
2023-10-09
Received by NHTSA
2023-11-06
NHTSA record numbers
10244906

Manufacturer summary

Original wording in English

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). If DTC P0420 is found to be stored in the ECM, follow the diagnostic procedures outlined below.

NHTSA manufacturer communications ↗

Reported code forms

P0420

Manufacturer wording

Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.

Check vehicle applicability

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MakeModelModel year
SubaruASCENT2021
SubaruASCENT2020
SubaruASCENT2019
SubaruCROSSTREK2023
SubaruCROSSTREK2022
SubaruCROSSTREK2021
SubaruCROSSTREK2020
SubaruCROSSTREK2019
SubaruCROSSTREK2018
SubaruCROSSTREK2017
SubaruFORESTER2023
SubaruFORESTER2022
SubaruFORESTER2021
SubaruFORESTER2020
SubaruFORESTER2019
SubaruFORESTER2018
SubaruFORESTER2017
SubaruIMPREZA2023
SubaruIMPREZA2022
SubaruIMPREZA2021
SubaruIMPREZA2020
SubaruIMPREZA2019
SubaruIMPREZA2018
SubaruIMPREZA2017
SubaruLEGACY2023
SubaruLEGACY2022
SubaruLEGACY2021
SubaruLEGACY2020
SubaruLEGACY2019
SubaruLEGACY2018

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