Part record

3.5L EcoBoost VCT Solenoid (Ford AT4Z-6M280-A / -B, one per intake/exhaust position; four per engine)

Card tables (both -A and -B): F-150 2011-2023 and 2015-2017 Expedition (Navigator is NOT listed). The 2018 timing-gear rows attribute AT4Z-6M280-A/-B to the 6 Cyl 3.3L Duratec (qty 2), while the 3.5L / 3.5L GTDI 2018+ rows carry HL3Z-6M280-A (qty 4) - so the 3.5L GTDI window here is clamped to 2011-2016 (Gen1 3.5 EcoBoost; the Gen2 engine arrived MY2017 with HL3Z). Dealer listings (River City Ford / Ourisman / Lakeland, checked 24.10) attribute the PN family to the 3.5L EcoBoost V6; -A and -B serve the different intake/exhaust positions, 4 per engine - verify the failed position (and bank) before ordering. Navigator 2015-2017 runs the same 3.5L EcoBoost but is not card-listed - verify VIN before ordering for a Navigator.