Fault code P0073 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P0073 – Ambient Air Temperature Sensor Circuit High

P0073: Causes, signs and repairs

Error code P0073 is displayed and the check engine light is on - what does this mean?

The OBD system has detected a fault in the ambient temperature sensor circuit, which is reporting excessive voltage values. This DTC P0073 indicates problems with the sensor that measures the outside temperature for various engine control functions. The fault code can occur with various manufacturers and affects engine performance and climate management.

What causes can this error code have?

Defective ambient temperature sensor
Short circuit in the sensor wiring
Corroded or loose plug connections
Damaged cable insulation
Faulty engine control unit (ECU)
Interruption in the sensor cable
Incorrect sensor voltage due to defective power supply

What symptoms occur in parallel with fault code P0073?

Air conditioning problems: The automatic air conditioning system is not working properly or is displaying incorrect temperatures
Engine performance: Irregular idling or poor engine performance at extreme temperatures
Display error: Incorrect outside temperature display on the dashboard
Fuel consumption: Increased fuel consumption due to incorrect temperature corrections
Starting behavior: Problems with cold starts or prolonged warm-up phase

How can the problem with error code P0073 be rectified?

The repair requires a systematic diagnosis of the electrical components and the sensor itself.
Replace the sensor: Completely replace and calibrate the defective ambient temperature sensor
Check and repair the wiring: Inspect all cables to the sensor for damage and replace defective sections
Clean plug connections: Remove corrosion from the plugs and treat with contact spray
Check the power supply: Measure the power supply to the sensor and repair if necessary
ECU diagnostics: Check the engine control unit for malfunctions and reprogram or replace if necessary
Complete system calibration: After the repair, have the entire temperature sensor system recalibrated

FAQ - Frequently asked questions about DTC P0073

Can I continue driving with error code P0073?

Yes, the vehicle is basically ready to drive, but the air conditioning and engine control may be impaired. You should drive carefully in extreme temperatures.

How much does it cost to repair error code P0073?

The costs vary between 80-300 euros, depending on the cause. A new sensor costs around 50-120 euros, labor costs an additional 80-150 euros.

How can I diagnose fault code P0073 myself?

You can read out the code using an OBD scanner. Visually check the cable connections and measure the sensor voltage with a multimeter.

Is fault code P0073 manufacturer-specific?

No, P0073 is a standardized EOBD code that has the same meaning for all manufacturers and indicates problems with the ambient temperature sensor.

Can cold weather trigger fault code P0073?

Extreme cold can increase the error, but is rarely the sole cause. There is usually a technical defect in the sensor or the wiring.

How often does trouble code P0073 occur?

This DTC is relatively rare and mainly occurs in older vehicles or after accident damage to the front of the vehicle.

Vehicles in which fault code P0073 occurs most frequently

Error code P0073 is a standardized OBD-II code for problems with the ambient temperature sensor and can occur with various manufacturers, but is most common in the following vehicles:

BMW: 3 Series, 5 Series, X3, X5 (2005-2015)
Mercedes-Benz: C-Class, E-Class, ML-Class, GLK (2006-2016)
Audi: A4, A6, Q5, Q7 (2004-2014)
Volkswagen: Passat, Tiguan, Touareg, Golf (2005-2013)
Ford: Focus, Mondeo, Kuga, S-Max (2007-2015)
Opel: Astra, Insignia, Antara, Zafira (2008-2016)
Peugeot: 308, 508, 3008, 5008 (2009-2017)
Renault: Megane, Laguna, Koleos, Scenic (2007-2015)

If code P0073 occurs in your vehicle, you should first check the plug connections of the ambient temperature sensor and visit a specialist workshop if problems persist. Most repairs are straightforward, but require precise diagnosis to optimize costs.

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