Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer thinks the sensor that tells it how warm or cold the air outside is, isn't working right.
The ambient air temperature sensor measures the temperature of the air outside the vehicle. This information is used by the car's computer to adjust various systems. If the sensor's readings are outside the expected range, the P0071 code is triggered.
The P0071 code is set when the Powertrain Control Module (PCM) detects a problem with the ambient air temperature sensor circuit. This could mean the sensor is giving readings that are not within the expected range, indicating a potential issue with the sensor itself or the wiring connected to it.
• Check Engine Light is on
• Incorrect outside temperature reading on the dashboard
• Possible impact on climate control system performance
• Faulty ambient air temperature sensor
• Wiring issues or poor connection in the sensor circuit
• Faulty PCM
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics II, a standardized system for self-diagnostics in vehicles
• Use an OBD-II scanner to confirm the P0071 code.
• Inspect the ambient air temperature sensor and its wiring for damage.
• Test the sensor with a multimeter to ensure it's functioning correctly.
• Replace the ambient air temperature sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$50 - $200
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect sensor and wiring for damage.
• Keep the sensor clean and free from debris.
• Ensure proper maintenance of the vehicle's electrical system.
Sensor Issue
• Check the outside temperature reading on your dashboard for accuracy.
• If the Check Engine Light is on, have the vehicle scanned for codes.
• Consult a professional mechanic if you're unsure about the repairs.
Check with your vehicle manufacturer; sensor issues may be covered under warranty if the vehicle is relatively new.
The P0071 code has been a common diagnostic trouble code for many years, often related to sensor or wiring issues.
Moderate – While it may not affect immediate drivability, it can impact other systems like climate control.
Driving with a malfunctioning sensor can lead to incorrect operation of vehicle systems. Always address Check Engine Light issues promptly.
• Vehicle should be at a stable temperature.
• Ensure the engine is off and cool before inspecting the sensor.
The ambient air temperature sensor is typically located at the front of the vehicle, near the grille or bumper.
Q: Can I drive with a P0071 code?
A: Yes, but it's best to fix it soon to ensure accurate temperature readings and proper vehicle function.
Q: How do I reset the Check Engine Light after fixing the issue?
A: Use an OBD-II scanner to clear the code, or disconnect the battery for a few minutes.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.