DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P0073
P0073 means the ambient air temperature sensor circuit is reporting a voltage higher than the powertrain control module expects, which usually indicates an open circuit or a sensor reading that is out of range. The computer has detected a signal voltage above its calibrated threshold for the ambient temperature input, so it flags the circuit as high.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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