Underhood: Audi Tech Tip: Passenger Compartment Not Warming Up?
- 2004-2010 F-150
- 2005-2010 F-250, F-350
- 2005-2013 Expedition
- 2006-2008 Mark LT
- 2005-2013 Navigator
- NOTE: All affected vehicles have the 5.4L 3-valve engine
Vehicles equipped with 5.4L 3-valve engine may exhibit an intermittent rattle noise while driving from idle up to 1,200 rpm when the engine is at operating temperature. In severe cases, a rough idle and diagnostic trouble codes (DTCs) P0022, P0021, P0340, and/or P0341 may be stored in the powertrain control module (PCM).
Replace the left and right variable cam timing (VCT) solenoids.