This article supersedes TSB 23-2337 to update the Service Procedure and the causal part. Some 2022-2023 F-150 hybrid vehicles equipped with a 3.5L PowerBoost engine may exhibit an illuminated MIL with diagnostic trouble codes (DTCs) P0420 and/or P0430 stored in the powertrain control module (PCM). This may be due to high sulfur content in the fuel. To correct the condition, follow the Service Procedure to reprogram the PCM and remove sulfur from the catalytic converters.
