P0073 OBD-II Trouble Code: Ambient Air Temperature Sensor Circuit High input

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0073 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0073 code

P0073 is a diagnostic trouble code (DTC) for "Ambient Air Temperature Sensor Circuit High input". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0073 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P0073 code definition

Ambient Air Temperature Sensor Circuit High input

Depending on the type of vehicle these are some related OBD-II Diagnostic Trouble Codes:

  • P0070: Ambient Air Temperature Sensor Circuit
  • P0071: Ambient Air Temperature Sensor Range/Performance
  • P0072: Ambient Air Temperature Sensor Circuit Low Input

What the P0073 code means

The Power Control Module (PCM) uses information that it receives from the ambient air temperature sensor to regulate the levels of the ambient air temperature and intake air temperature.

If the ambient air temperature reaches a level above that of the intake air temperature, the Power Control Module (PCM) will store the P0073 trouble code and the Check Engine Light will come on.

What causes the P0073 code?

There are several things that could cause the P0073 trouble code to be stored by the Power Control Module (PCM):

  • The ambient air temperature sensor has malfunctioned
  • The wiring has shorted or broken
  • There is corrosion in the electric circuitry or connector
  • A break or short in the ambient air temperature harness
  • Debris that is covering the sensor

What are the symptoms of the P0073 code?

The biggest indication of a problem with the ambient air temperature system is that the Check Engine Light is on. In certain cases, the climate control system (heat and/or air condition controls) will not work as they should.

How does a mechanic diagnose the P0073 code?

  • Freeze frame data and trouble codes are recorded using an OBD-II scanner.

  • Next, the ambient air temperature sensor’s electrical circuitry and its connector should be inspected for bare wires, shorts or opens in the wires, and corrosion. Anything possibly covering the ambient air temperature sensor should be removed as well. If necessary, repair or replace any of these components.

  • The P0073 trouble code should be cleared and the a test drive of the vehicle should be conducted a test drive to see if the trouble code returns.

  • If the trouble code does not return, the repair is complete. In the event that the trouble code returns immediately, the ambient air temperature sensor needs to be replaced.

  • If the trouble code doesn’t come back immediately, but still returns, this could be an indication of an intermittent problem regarding the voltage leading to the Power Control Module (PCM). If this is the case, more extensive diagnosis would be required.

  • In the unlikely event that none of these measures have resolved the ambient air temperature sensor problem and cleared the P0073 code, it is possible the there is a problem with the Power Control Module (PCM). This is extremely rare.

Common mistakes when diagnosing the P0073 code

It is common for the ambient air temperature sensor to be replaced without first inspecting the wiring and connector for defects. It is not always necessary to replace the entire ambient air temperature sensor.

How serious is the P0073 code?

The P0073 trouble code is not considered to be one that is serious, as it does not affect the drivability or functioning of the vehicle. This may, however, be one that causes the driver to be uncomfortable as it could prevent the climate control system (heat and/or air condition controls) from working as they should.

What repairs can fix the P0073 code?

  • Repair or replace wires that have shorts or breaks in them
  • Absolve the electric circuitry and connector from any possible corrosion
  • Replace the ambient air temperature sensor

Additional comments for consideration regarding the P0073 code

It is important to inspect the wires and connector for damage or defects before replacing the ambient air temperature sensor.

Need help with a P0073 code?

YourMechanic offers certified mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

Check Engine Light
P0073
trouble codes

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0073 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,636

Rating Summary
3,315
161
42
24
94
3,315
161
42
24
94

Jeffrey

24 years of experience
683 reviews
Jeffrey
24 years of experience
Very nice and helpful did a great job on my car.
2007 PONTIAC G5 - CHECK ENGINE LIGHT IS ON - CHARLOTTE, NORTH CAROLINA

Rigoberto

8 years of experience
517 reviews
Rigoberto
8 years of experience
He is very knowledgeable, detected in one hour what another shop could not detect in 3 days.
2002 HONDA ODYSSEY - CHECK ENGINE LIGHT IS ON - BERWYN, ILLINOIS

Chris

19 years of experience
1240 reviews
Chris
19 years of experience
Thanks Chris, so far no engine light on.
2007 GMC SIERRA 1500 - CHECK ENGINE LIGHT IS ON - ORANGE, CALIFORNIA

Kevin

21 years of experience
110 reviews
Kevin
21 years of experience
Showed up super early, knowledgeable... overall nice guy. Will book Kevin for future jobs.
2004 NISSAN ALTIMA - CHECK ENGINE LIGHT IS ON - NORCROSS, GEORGIA

More related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP)...

Related questions

Q: Car drives poorly with heavy fuel consumption and poor transmission

Hi and thanks for contacting YourMechanic. First, with the dirty cooling system, you would need to perform a coolant flush and replace the thermostat and radiator cap. This will help with the overheating issue if you are still experiencing that....

Q: Check Engine Light came on. Car also has problems cranking but only when I refill it with gas.

Hi there - the first thing to do is extract the problem code(s) which are setting the "Check Engine" light. This will more efficiently direct resolution of the problem. Evaporative emission system problems are often associated with "fill-up" issues like...

Q: Check Engine Light is on - 2009 Chevrolet Malibu

If you have codes to a sensor, it does not always mean the sensor is bad. There may be wiring or connector problems causing erratic or incorrect sensor input to the computer. The code stored in a computer is only...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com