Lincoln Navigator U554

The 3.5L twin-turbo V6 in the Navigator U554 is the revised Gen-2 engine with port and direct injection. Cam phaser wear was a documented issue in early 2018–2020 builds — Ford ran Customer Satisfaction Program 21N03. The 10R10 automatic works cleanly when freshly calibrated; 10R80 shudder is a separate vehicle-level topic. Oil changes at 10,000 km intervals matter for turbo longevity.

• !! Cam Phaser Failure from 80,000 km

  Premature cam phaser wear in the 3.5L EcoBoost Navigator 2018–2020. Ford ran Customer Satisfaction Program 21N03 with extended warranty coverage through Jan 2023.

  Symptoms: Rattling on cold start, check engine light (P0011/P0021), rough idle immediately after shutdown.
  800–2,500 $
  Ad Cam Phaser 3.5 EcoBoost NavigatorVariable Cam Timing Actuator Ford 3.5L V6 Gen2Ford 21N03 Cam Phaser
• !! Exhaust Manifold Warp and Leak from 100,000 km

  The exhaust manifold on the 3.5L EcoBoost can warp thermally and allow exhaust gases to escape. Typically occurs after 100,000 km; dealers know this issue well.

  Symptoms: Ticking or popping noise on cold start from the engine bay, exhaust smell inside the cabin.
  600–2,500 $
  Ad Exhaust Manifold Gasket 3.5L Ford NavigatorExhaust Manifold 3.5 EcoBoost V6
• !! Recall: Engine Oil Leak from Misaligned Cup Plug (2024)

  Recall on 2024 Lincoln Navigator: a block cup plug can back out due to vibration, causing an engine oil leak. Ford remedies free of charge at the dealer.

  Symptoms: Visible oil beneath the vehicle, oil pressure warning, potential engine damage if ignored.
  0–0 $
  Ad Ford Navigator 2024 Recall Oil LeakCup Plug Ford 3.5L EcoBoost Engine Block

+ 3 more engine weaknesses + vehicle weaknesses