The P0073 trouble code shows that the powertrain control module has received an uncommon signal from the ambient air temperature sensor. If any ambient air temperature reading exceeds the temperature of the intake air which is perceived, this would store the code in the powertrain control module and would give rise to the illumination of service engine soon lamp.
What causes this problem with the Ambient Air Temperature Sensor Circuit High Input?
Faults in the ambient air temperature sensor
The harness of the ambient air temperature sensor can get opened or shorted
Bad electrical connection in the ambient air temperature sensor
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