Ambient Air Temperature Sensor Circuit High Input
The car is reading the outside air temperature as too high or the sensor signal is out of range. This usually means the sensor, wiring, or connector has a problem. It can also happen if the sensor is damaged or unplugged.
You can usually keep driving, but the temperature display, climate control, or related engine strategy may be affected. Fix it soon, especially if other temperature-related warning lights appear.
P0073 is set when the engine control module sees a high voltage signal from the ambient air temperature sensor circuit. This typically means the circuit is open, the sensor is disconnected, or there is corrosion or damage in the wiring. In some vehicles, a faulty sensor reading can affect the display, HVAC behavior, or intake/engine management calculations.
It means the ambient air temperature sensor circuit has a high input signal, usually from an open circuit, bad sensor, or wiring problem.
It is often mounted behind the front grille, near the radiator support, in the front bumper area, or sometimes in a side mirror.
Usually it mainly affects the outside temperature reading and some climate control functions, but it should still be repaired because the signal is not correct.
You can clear it temporarily, but it will likely return if the sensor or wiring problem is still present.