Issue:
Some 2020-2021 Expedition/Navigator vehicles may exhibit an illuminated malfunction indicator lamp (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.
Action:
Follow the service procedure to correct the condition if the vehicle meets the specified criteria.
Service Procedure:
The procedure involves diagnosing and repairing the issue, including performing pinpoint tests, retrieving onboard diagnostics (OBD) Mode 6 Data, and performing a sulfur removal cycle.
Warranty Status:
The repair is eligible under provisions of New Vehicle Limited Warranty (NVLW), Emissions Warranty/Service Part Warranty (SPW), Special Service Part (SSP), and Extended Service Plan (ESP) coverage.
Manual:
Download: 2020-2021 Ford Expedition and Lincoln Navigator Technical Service Bulletin
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