Ford Expedition 2020–2021 — technical service bulletin
Bulletin TSB 21-2381 · NHTSA communication 10203646 · issued Nov 19, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2020–2021
model years
4
vehicle entries
Official summary
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. To correct the condition, follow the Service Procedure to de-sulfate the catalytic convertors.
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.