P0073
Fix when convenientThe Ambient Air Temperature (AAT) sensor sends a signal to your car's computer about the outside air temperature. Code P0073 means the computer is receiving a voltage signal from this sensor that is too high, indicating an electrical problem in the sensor circuit.
Code P0073 means your car's computer sees a high voltage signal from the ambient air temperature sensor. Common causes: Bad AAT sensor (85%), wiring issues (10%). Drivability: Yes, safe to drive. Repair cost: $15-$50 DIY, $75-$200 professional.
Can I Drive With P0073?
Yes, safe to drive
No restrictions
Stop driving immediately if: Not applicable for this code, as it does not cause critical drivability issues.
Symptoms of P0073
- 1Incorrect outside temperature display (often reads very high or maxed out)
- 2Automatic climate control system not working correctly (AC might not engage, heat might be inconsistent)
- 3Engine cooling fan running more than expected (in some vehicles)
- 4Minor changes in fuel economy (rare, but possible)
Common Causes of P0073
Parts most likely causing this code, ranked by probability
The sensor itself has failed internally, sending an incorrect high voltage signal to the computer.
85% of P0073 cases are fixed by replacing this part
Damage, corrosion, or an open circuit in the wiring or connector leading to the AAT sensor can cause a high voltage reading.
10% of P0073 cases are fixed by repairing the wiring
A rare internal fault within the vehicle's main computer can misinterpret the sensor's signal or fail to process it correctly.
5% of P0073 cases are fixed by replacing the PCM
Check These First (Before Buying Parts)
- Visually inspect the AAT sensor and its electrical connector for any visible damage, corrosion, or loose wires. The sensor is often located in the front bumper area or behind the grille.
How to Diagnose P0073
- 1Visually inspect the Ambient Air Temperature (AAT) sensor and its wiring for any obvious damage, corrosion, or loose connections.
- 2Locate the AAT sensor (often in the front bumper area, behind the grille, or in a side mirror) and disconnect its electrical connector.
- 3Using a multimeter, check the resistance of the AAT sensor. Compare the reading to your vehicle's service manual specifications for various temperatures. An open circuit (infinite resistance) or a very high resistance indicates a faulty sensor.
- 4With the sensor disconnected, check the voltage at the sensor's wiring harness connector. One wire should have a reference voltage (usually 5V), and the other should be a ground. If the reference voltage is missing or incorrect, trace the wiring back to the PCM.
- 5If the sensor and wiring check out, use a scan tool to monitor the AAT sensor's live data. If the reading is stuck high or erratic, and the sensor and wiring are confirmed good, the PCM might be at fault.
P0073 on Popular Vehicles
Toyota Camry
2007-2024On many Camry models, the AAT sensor is located behind the front bumper cover, often clipped into the grille or a support bracket. It's a common failure point due to exposure.
85% fixed by replacing the AAT sensor
Honda Accord
2003-2024Accord AAT sensors are typically found in the front bumper area, sometimes integrated into the side mirror assembly on higher trims. Check both locations if the bumper sensor isn't obvious.
85% fixed by replacing the AAT sensor
Ford F-150
2004-2024For F-150 trucks, the AAT sensor is usually in the front bumper or grille area. Its exposed position makes it susceptible to damage from road debris or minor impacts.
85% fixed by replacing the AAT sensor
Frequently Asked Questions
What does P0073 mean?
P0073 indicates that the Ambient Air Temperature (AAT) sensor circuit is reporting a voltage signal that is too high to your vehicle's computer. This usually means the sensor itself is faulty or there's an issue with its wiring.
Can I drive with P0073?
Yes, you can drive safely with a P0073 code. This code primarily affects your vehicle's climate control system and the accuracy of the outside temperature display. It does not typically cause critical engine damage or drivability issues.
Will P0073 clear itself?
No, P0073 will not clear itself. The Check Engine Light will remain on until the underlying issue with the ambient air temperature sensor or its circuit is diagnosed and repaired. Once fixed, you can clear the code with a scan tool.
How do I fix P0073 myself?
Start by visually inspecting the AAT sensor and its wiring for damage. If no obvious issues are found, test the sensor's resistance with a multimeter. If the sensor is faulty, replace it. If the sensor tests good, check the wiring for continuity and voltage. Most often, replacing the AAT sensor resolves this code.
How much does it cost to fix P0073?
The cost to fix P0073 is relatively low. If you do it yourself, an Ambient Air Temperature sensor typically costs $15-$50. If you take it to a shop, expect to pay $75-$200, which includes parts and labor.
P0073 keeps coming back - why?
If P0073 keeps returning, it means the initial repair did not address the root cause. This often points to an intermittent wiring issue that was missed, corrosion in the connector, or a rare fault with the Powertrain Control Module (PCM) itself. Double-check all wiring and connections thoroughly.
Will P0073 fail emissions/smog test?
Yes, P0073 will cause your vehicle to fail an emissions or smog test. Any active Check Engine Light (CEL) indicates a fault in the system, and most states will automatically fail a vehicle with a CEL illuminated, regardless of the specific code.
What's the difference between P0073 and P0072?
P0073 indicates an 'Ambient Air Temperature Sensor Circuit High Input,' meaning the computer is seeing a voltage signal that is too high. P0072 indicates an 'Ambient Air Temperature Sensor Circuit Low Input,' meaning the computer is seeing a voltage signal that is too low. Both point to a problem with the AAT sensor or its circuit, but in opposite electrical directions.
P0073 on Ford F-150?
On many Ford F-150 models, the Ambient Air Temperature sensor is located in the front bumper area, often behind the grille or near the radiator support. It's exposed to road debris and weather, which can lead to sensor failure or wiring damage. The diagnostic steps remain the same: inspect, test, and replace the sensor if faulty.
Questions to Ask Your Mechanic
Did you visually inspect the AAT sensor and its wiring for any damage or corrosion?
Good answer: Yes, I checked the sensor and connector. The wiring looks good, but the sensor itself was corroded/damaged.
What were the voltage and resistance readings from the AAT sensor circuit?
Good answer: The sensor showed an open circuit (infinite resistance), confirming it's bad. The wiring had proper 5V reference voltage.
Repair Cost Estimate
DIY Repair
Parts only
$15-$50
Shop Repair
Parts + labor
$75-$200
Save $60-$150 by doing it yourself
Difficulty
beginner
Time
0.5-1 hours
Beginner-friendly - The AAT sensor is usually easy to access and replace with basic hand tools and a multimeter for testing.
Cost of Waiting
Ignoring P0073 means your outside temperature display will be inaccurate, and your automatic climate control system will not function correctly, leading to discomfort. While it won't cause major engine damage, it's a simple and inexpensive fix that restores full functionality to your vehicle's comfort systems.
While You're In There...
Cleaning the electrical connector pins can resolve intermittent connection issues and prevent future corrosion, ensuring a solid signal.
Tools You'll Need
- Basic hand tools (screwdriver, wrench)
- Multimeter
- Wire strippers/crimpers (if wiring repair is needed)
P0073 is a straightforward code to diagnose and fix. Most repairs involve replacing an inexpensive sensor, and your vehicle's climate control will be back to normal quickly.
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Your Next Steps
Step 1: Locate the Ambient Air Temperature sensor (check your owner's manual or online forums for specific location on your vehicle, often in the front bumper area). Visually inspect the sensor and its wiring for any damage, fraying, or corrosion.
Step 2: If the visual inspection doesn't reveal an obvious problem, disconnect the sensor and use a multimeter to test its resistance. Compare the reading to your vehicle's service manual specifications. If the resistance is out of spec or shows an open circuit, replace the sensor.
Step 3: If the sensor tests good, check the wiring harness for continuity and proper voltage (usually 5V reference). Repair any damaged wiring or corroded connectors. Parts you'll likely need: new Ambient Air Temperature sensor.