AutoCodes – Generic – P0071

P0071 Code - Ambient Air Temperature Sensor Performance

Quick Answer

The Engine Control Module (ECM) monitors the ambient air temperature sensor with a low reference circuit and signal circuit. Common causes include Faulty Ambient Air Temperature 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 indicates Ambient Air Temperature Sensor Performance.
Common causes: Common causes include Faulty Ambient Air Temperature 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.

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Code Popularity 33,288

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0071 Description

The Engine Control Module (ECM) monitors the ambient air temperature sensor with a low reference circuit and signal circuit. The ECM monitors the voltage drop across the sensor, which is inversely proportional to temperature. When the ambient air temperature is cold, the resistance of the sensor is high. When the ambient air temperature is warm, the resistance of the sensors is low. The engine control module converts the voltage value to a temperature value and sends the value to the Display Module via serial data. The Display Module displays the temperature. The Diagnostic Trouble Code (DTC) will be set if the ECM detects that during the first 20s of run time after the 1 hour soaking period, the difference between the outside air temperature and the engine intake air temperature is greater than 30°C (86°F).

OBDII Code P0071 - Ambient Air Temperature Sensor Performance - AutoCodes.com — P0071 Code - Ambient Air Temperature Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P0071?

Faulty Ambient Air Temperature Sensor
Ambient Air Temperature Sensor harness is open or shorted
Ambient Air Temperature Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0071?

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 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.

Need more information about the P0071 code?

Need more information on how to fix the P0071 code? Get Access to Factory Service Manuals

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Information for Specific Makes

P0071 Audi — Ambient Air Temperature Sensor Circuit Range/Performance Fault
P0071 BMW — Ambient Sensor Rationality Check
P0071 Buick — Ambient Air Temperature Sensor Performance
P0071 Cadillac — Ambient Air Temperature Sensor Performance
P0071 Chevrolet — Ambient Air Temperature Sensor Performance
P0071 Chrysler — Ambient Air Temperature Sensor Performance
P0071 Dodge — Ambient Air Temperature Sensor Performance
P0071 Ford — Ambient Air Temperature Sensor Circuit 'A' Range/Performance
P0071 GMC — Ambient Air Temperature Sensor Performance
P0071 Hyundai — Ambient Air Temperature Sensor Performance
P0071 Jeep — Ambient Air Temperature Sensor Performance
P0071 Kia — Ambient Air Temperature Sensor Performance
P0071 Land Rover — Ambient Air Temperature Sensor Range/Performance
P0071 Lincoln — Ambient Air Temperature Sensor Circuit 'A' Range/Performance
P0071 Mercedes-Benz — Ambient Air Temperature Sensor Range/Performance
P0071 MINI — Ambient Sensor Rationality Check
P0071 Mitsubishi — Ambient Air Temperature Sensor Performance
P0071 Volkswagen — Ambient Air Temperature Sensor Circuit Range/Performance Fault
P0071 Volvo — Ambient Air Temperature Sensor Performance

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0071 Code

1. What are the common symptoms of OBDII code P0071 (Ambient Air Temperature Sensor Performance)?

- Common symptoms include inaccurate temperature readings on the dashboard, poor fuel efficiency, and potential impact on the air conditioning system.

2. What are the possible causes of OBDII code P0071?

- The code P0071 is often caused by a faulty ambient air temperature sensor, damaged wiring or connectors, or issues with the sensor's circuit.

3. How can I diagnose the issue related to OBDII code P0071?

- Diagnose the issue by checking the sensor's wiring and connectors for damage, testing the sensor's resistance, and verifying the sensor's temperature readings against actual ambient temperature.

4. How can I repair OBDII code P0071?

- Repair options may include replacing the ambient air temperature sensor, repairing damaged wiring or connectors, or resetting the error code after verifying proper sensor function.

5. Can I drive my vehicle with OBDII code P0071?

- It is generally safe to drive with code P0071, but it is important to address the issue promptly to prevent potential fuel efficiency problems or damage to other components.

6. Will OBDII code P0071 cause my check engine light to illuminate?

- Yes, code P0071 typically triggers the check engine light to alert the driver of a potential issue with the ambient air temperature sensor.

7. How do I reset OBDII code P0071 after making repairs?

- Use an OBDII scanner to clear the error code and reset the check engine light after addressing the underlying issue with the ambient air temperature sensor.

8. Can extreme weather conditions affect the performance of the ambient air temperature sensor?

- Yes, extreme heat or cold can impact the accuracy and performance of the ambient air temperature sensor, potentially leading to the triggering of code P0071.

9. What should I do if I suspect a problem with my ambient air temperature sensor but do not see OBDII code P0071?

- If you suspect an issue with the sensor but the code has not appeared, it is recommended to perform a thorough inspection and testing of the sensor to prevent potential future problems.

10. Is it possible to clean the ambient air temperature sensor to resolve issues related to OBDII code P0071?

- Cleaning the sensor may temporarily improve its performance, but if the code persists, it is advisable to replace the sensor to ensure accurate readings and prevent further issues.