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The 2012 Ford Focus ambient air temperature sensor can be found up front in the engine bay. It's typically positioned behind the grille, right in front of the radiator and radiator support. This sensor is responsible for measuring the outside temperature of the vehicle, which the computer uses as a reference for its calculations. The computer will keep an eye on the signal from the ambient temperature sensor and automatically make adjustments to keep the cabin temperature comfortable. On average, replacing the ambient air temperature sensor will cost you between $85 and $102. Labor typically runs between $53 and $66, while the parts themselves are priced at around $32 to $36.
The outside temperature sensor for the 2012 Ford Focus can be located nestled between the second and third spark plugs.