Ford Expedition 2017–2020 — technical service bulletin
Bulletin 21N03-S4 · NHTSA communication 10209366 · issued Mar 25, 2022
Technical service bulletin
communication type
Engine and Engine Cooling
component
2017–2020
model years
10
vehicle entries
Official summary
Certain 2017-2020 Model Year F-150, 2018-2020 Expedition, and 2018-2020 Navigator Vehicles Equipped with a 3.5L GTDI Engine - Cam Phase Replacement. Parts Requirements / Order information - Intake Gaskets HL3Z-9439-A should be inspected and only replaced if damaged. It is no longer required to replace these gaskets.
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.