P0073

Symptoms

• Incorrect display of outside temperature on the dashboard
• Incorrect operation of the air conditioning system
• Problems with automatic climate control
• Slightly increased fuel consumption
• Check Engine Light Illuminates

Causes

• Ambient temperature sensor malfunction
• Broken wiring in the sensor circuit
• Short circuit of wires to power
• Corrosion or oxidation of connector contacts
• Damage to wiring due to mechanical stress
• Malfunction of the engine control unit (rare)

How to Fix

1. Connect the diagnostic scanner and read the error codes
2. Locate the ambient temperature sensor (usually in the front bumper)
3. Visually check the condition of the sensor and wiring
4. Measure the resistance of the sensor with a multimeter
5. Check the integrity of the wiring from the sensor to the ECU
6. Check supply voltage and signal circuits
7. Clean the connector contacts from corrosion if necessary.
8. Replace the sensor if a fault is detected
9. Repair damaged wiring
10. Clear error codes and test drive

Related codes

Error P0073 by Vehicle Brand