In December 2019, the Office of Defects Investigation (ODI) opened this investigation based on 235 Vehicle Owner Questionnaires (VOQs) alleging doors failed to latch when closed, and/or inadvertently opened while driving, on model year (MY) 2012-2014 Ford Fiesta, and 2013-2014 Fusion and Lincoln MKZ. Some VOQs reported the failure occurred after the latch had been remedied under a prior recall which involved fracture of the latch pawl spring tab due to thermally induced cyclic fatigue. Other VOQs alleged a similar failure in vehicles not previously recalled. A latch with a fractured pawl spring tab typically results in a ?door will not close? condition, however in certain somewhat rare circumstances, may result in the door coming open while driving. In response to ODI?s investigation, Ford has announced three field actions, as discussed below.On March 23, 2020, Ford submitted Safety Recall 20V-177 (Ford 20S15), a regional recall campaign to address door latch failures in vehicles not previously recalled under Safety Recalls 15V-246, 16V-643 and 17V-210. The recall affects vehicles currently or ever registered in certain high ambient temperature states (see 20V-177 for affected states). As a remedy, Ford will replace all four door latches free of charge.On August 24, 2020, Ford issued a non-safety regional field action (Ford 20R01) to address door latch failures on the same model/MY vehicles not covered under 20V-177 (i.e., not currently/ever registered in affected states). According to Ford, spring tab failure rates for vehicles covered by this action are about half that of the 20V-177 vehicles. Under this action, dealers will replace all door latches, free of charge, if either; a) the vehicle exhibits a related latch concern, or b) if the vehicle owner expresses a concern about the latches in their vehicles. Details can be found under NHTSA TSB No. 10190990, a copy of which is available in this investigative file available at NHTSA.gov.On June 8, 2020, Ford submitt