AutoCodes – Infiniti – P0031 Infiniti

P0031 Infiniti Code - Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low

Quick Answer

Air-Fuel Ratio (A/F)sensor need to reach a minimum operating temperature of 1200 degrees F to produce an accurate voltage signal. Common causes include Faulty Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1, Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 harness is open shorted to ground, Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0031 Infiniti indicates Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low.
Common causes: Common causes include Faulty Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1, Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 harness is open shorted to ground, Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 22,068

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 21, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0031 Infiniti Description

Air-Fuel Ratio (A/F)sensor need to reach a minimum operating temperature of 1200 degrees F to produce an accurate voltage signal. The faster the air-fuel ratio sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).
In order to achieve the require temperature, a heater element is included inside the air-fuel ratio sensor. The ECM controls the air-fuel ratio sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

OBDII Code P0031 Infiniti - Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low - AutoCodes.com — P0031 Infiniti Code - Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0031 Infiniti?

Faulty Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1
Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 harness is open shorted to ground
Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit poor electrical connection
Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit fuse
Faulty Engine Control Module (ECM)

How to Fix the DTC P0031 Infiniti?

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 does this mean?

Code Tech Notes

For models before 2005 see: P0031 Infiniti

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0031 Infiniti 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 P0031 Infiniti code?

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Information for Specific Infiniti Models

P0031 2003 Infiniti G35 — Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low
P0031 2004 Infiniti G35 — Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low
P0031 2005 Infiniti G35 — HO2S11 Heater Control Circuit Low
P0031 2006 Infiniti G35 — HO2S11 Heater Control Circuit Low

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 P0031 Infiniti Code

1. What are the common symptoms of OBDII code P0031 in an Infiniti related to the Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low?

- Common symptoms include poor fuel economy, rough idling, and an illuminated check engine light on the dashboard.

2. What are the possible causes of OBDII code P0031 in an Infiniti related to the Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low?

- Possible causes include a faulty air fuel ratio sensor, damaged wiring or connectors, a blown fuse, or an issue with the engine control module.

3. How serious is OBDII code P0031 in an Infiniti related to the Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low?

- While the vehicle may still be operable with this code, it is important to address it promptly to prevent potential long-term damage to the engine and emissions system.

4. Can I drive my Infiniti with OBDII code P0031 related to the Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low?

- It is generally safe to drive the vehicle for a short period with this code, but it is recommended to have it diagnosed and repaired as soon as possible to avoid further issues.

5. How can I diagnose and repair OBDII code P0031 in an Infiniti related to the Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low?

- Diagnosing and repairing this code typically involves testing the air fuel ratio sensor, checking the wiring and connectors for damage, inspecting the fuse, and scanning the engine control module for faults.

6. Is it possible to reset OBDII code P0031 in an Infiniti related to the Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low without fixing the underlying issue?

- While you can clear the code using an OBDII scanner, the underlying issue causing the code will persist until it is properly diagnosed and repaired.

7. How much does it cost to fix OBDII code P0031 in an Infiniti related to the Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low?

- The cost of repairing this code can vary depending on the exact cause of the issue, but it may range from $200 to $500 or more, including parts and labor.

8. Are there any DIY repair tips for addressing OBDII code P0031 in an Infiniti related to the Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low?

- DIY enthusiasts with automotive experience may attempt to replace the air fuel ratio sensor, check and repair the wiring and connectors, or inspect the fuse themselves to address this code.

9. How long does it take to repair OBDII code P0031 in an Infiniti related to the Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low?

- The repair time can vary depending on the exact cause of the issue and the skill level of the technician, but it typically takes 1-3 hours to diagnose and fix this code.

10. Can OBDII code P0031 in an Infiniti related to the Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low cause other problems if left unresolved?

- Ignoring this code may lead to decreased fuel efficiency, potential damage to the engine, and increased emissions, so it is crucial to address it promptly to avoid further complications.