The outside air temperature sensor is a core sensing component of complete vehicles, which is generally arranged on the front bumper grille and cabin deflector. With the rapid development of new energy vehicles, front bumper grilles are designed with smaller opening areas to reduce aerodynamic drag and improve vehicle cruising range, which reduces the intake of fresh ambient air and significantly raises the layout requirements for outside air temperature sensors. This paper conducts statistical analysis on the relative YZ-direction positional relationship between the outside air temperature sensor and the condenser of mass-produced vehicle models. It analyzes the root cause of abnormally high temperature detection of the outside air temperature sensor during the development phase of a specific new energy vehicle model, and explores the influence of the ratio of the sensor's X-direction distance to the condenser and the grille opening size on sensor detection temperature. Finally, a complete quantitative evaluation system and method for the layout of vehicle outside air temperature sensors is established, which effectively improves the layout reliability of outside air temperature sensors in new energy vehicles.