P0071 Ford Code - Ambient Air Temperature Sensor Circuit 'A' Range/Performance
Quick Answer
The Ambient Air Temperature (AAT) Sensor is a thermistor device in which resistance changes with temperature. Common causes include Faulty Ambient Air Temperature (AAT) Sensor, Ambient Air Temperature Sensor harness is open or shorted, Ambient Air Temperature Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0071 Ford indicates Ambient Air Temperature Sensor Circuit 'A' Range/Performance.
- Common causes
- Common causes include Faulty Ambient Air Temperature (AAT) Sensor, Ambient Air Temperature Sensor harness is open or shorted, Ambient Air Temperature Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0071 Ford Description
Thermistor type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow. Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The AAT sensor provides ambient air temperature information to the PCM for the temperature sensor correlation tests. The PCM also communicates the AAT sensor information to all other modules on the controller area network (CAN).
This Diagnostic Trouble Code (DTC) sets when the ambient air temperature (AAT) sensor reading does not correlate with the other temperature sensor readings at ignition ON. The PCM runs this logic after an engine off and a calibrated soak period, typically 6 to 8 hours. This soak period allows the AAT sensor and the other temperature sensors to stabilize and not differ by greater than a calibrated value, typically 18°C (32.4°F).
What are the Possible Causes of the DTC P0071 Ford?
- Faulty Ambient Air Temperature (AAT) Sensor
- Ambient Air Temperature Sensor harness is open or shorted
- Ambient Air Temperature Sensor circuit poor electrical connection
How to Fix the DTC P0071 Ford?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0071 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Ford Models
- P0071 2015 Ford F150 — Ambient Air Temperature Sensor Circuit 'A' Range/Performance
- P0071 2016 Ford F150 — Ambient Air Temperature Sensor Circuit 'A' Range/Performance
- P0071 2017 Ford F150 — Ambient Air Temperature Sensor Circuit 'A' Range/Performance
- P0071 2018 Ford F150 — Ambient Air Temperature Sensor Circuit 'A' Range/Performance
- P0071 2019 Ford F150 — Ambient Air Temperature Sensor Circuit 'A' Range/Performance
- P0071 2020 Ford F150 — Ambient Air Temperature Sensor Circuit 'A' Range/Performance
Frequently Asked Questions about P0071 Ford Code
1. What are the common symptoms of OBDII code P0071 in a Ford vehicle?
The common symptoms of OBDII code P0071 in a Ford vehicle include inaccurate ambient air temperature readings on the dashboard, poor fuel efficiency, and potential issues with the vehicle's climate control system.
2. What could be the possible causes of OBDII code P0071 in a Ford vehicle?
The possible causes of OBDII code P0071 in a Ford vehicle may include a faulty ambient air temperature sensor, damaged wiring or connectors related to the sensor, or a malfunction in the sensor circuit.
3. How can I diagnose the ambient air temperature sensor circuit 'A' range/performance issue in my Ford vehicle?
Diagnosing the ambient air temperature sensor circuit 'A' range/performance issue in your Ford vehicle involves checking the sensor's wiring and connectors for any damage, testing the sensor's resistance, and verifying the sensor's readings with a scan tool.
4. Is it safe to continue driving my Ford vehicle with OBDII code P0071 triggered?
It is generally safe to continue driving your Ford vehicle with OBDII code P0071 triggered, but it is recommended to address the issue promptly to avoid potential fuel efficiency problems and further damage to the vehicle's systems.
5. What are some repair tips for fixing OBDII code P0071 in a Ford vehicle?
Some repair tips for fixing OBDII code P0071 in a Ford vehicle include checking and cleaning the sensor connections, replacing the ambient air temperature sensor if necessary, and clearing the trouble code with a diagnostic tool after completing the repairs.
6. Can a DIY enthusiast fix OBDII code P0071 in a Ford vehicle?
Yes, a DIY enthusiast can potentially fix OBDII code P0071 in a Ford vehicle by following repair guides, using the right tools, and being cautious when working with electrical components.
7. How much does it typically cost to repair OBDII code P0071 in a Ford vehicle at a mechanic or dealership?
The cost to repair OBDII code P0071 in a Ford vehicle at a mechanic or dealership may vary depending on the specific issue, parts needed, labor rates, and location. It is advisable to obtain quotes from different sources for an accurate estimate.
8. Will resetting the OBDII system clear the P0071 trouble code in my Ford vehicle?
Resetting the OBDII system may temporarily clear the P0071 trouble code in your Ford vehicle, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and fix the root cause of the problem.
9. How long does it typically take to repair OBDII code P0071 in a Ford vehicle?
The time it takes to repair OBDII code P0071 in a Ford vehicle can vary based on the complexity of the issue, availability of parts, and the skill level of the person performing the repairs. It could range from a quick fix to a couple of hours.
10. Are there any recalls or service bulletins related to OBDII code P0071 in Ford vehicles?
It is advisable to check with Ford dealerships or online resources for any recalls or service bulletins related to OBDII code P0071 in Ford vehicles. Manufacturers may provide guidance or assistance for known issues related to this trouble code.
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