APDTY 028957 Mass Air Flow Meter MAF Sensor Fits 4.6L or 5.4L Engine On 1999-2002 Expedition or Navigator 1999-2003 Ford F150 (2004 F-150 Heritage Model; Replaces XL3Z12B579BBRM, AFLS174RM) Meets Or Exceeds OEM Specs Factory OEM Fit Form And Function