Engine-CodesToyota – P0031 Toyota

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

Quick Answer

The P0031 code for Toyota indicates a problem with the Oxygen Air-Fuel Ratio Sensor Heater Control Circuit on Bank 1 Sensor 1. Common causes include Faulty Oxygen Air-Fuel Ratio Sensor, Broken or damaged wiring in the heater circuit, Corrosion or poor connections in the sensor's electrical connections. 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 Toyota indicates Oxygen Air-Fuel Ratio Sensor Heater Control Circuit Low Bank 1 Sensor 1.
Common causes
Common causes include Faulty Oxygen Air-Fuel Ratio Sensor, Broken or damaged wiring in the heater circuit, Corrosion or poor connections in the sensor's electrical connections.
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.
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P0031 Toyota Description

The P0031 code for Toyota indicates a problem with the Oxygen Air-Fuel Ratio Sensor Heater Control Circuit on Bank 1 Sensor 1. This sensor is responsible for measuring the oxygen content in the exhaust gases and providing feedback to the engine control module to adjust the air-fuel mixture for optimal combustion. The heater control circuit is essential for ensuring the sensor reaches operating temperature quickly, especially during cold starts, to provide accurate readings.

OBDII Code P0031 Toyota - Oxygen Air-Fuel Ratio Sensor Heater Control Circuit Low Bank 1 Sensor 1
P0031 Toyota Code - Oxygen Air-Fuel Ratio Sensor Heater Control Circuit Low Bank 1 Sensor 1

Common Causes of P0031 Toyota

  1. Faulty Oxygen Air-Fuel Ratio Sensor
  2. Broken or damaged wiring in the heater circuit
  3. Corrosion or poor connections in the sensor's electrical connections
  4. Issues with the engine control module
  5. Exhaust leaks near the sensor

Symptoms of P0031 Toyota

  1. Check Engine Light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Rough idling or stalling
  4. Poor acceleration or hesitation
  5. Increased emissions

How to Fix P0031 Toyota

  1. Diagnose the issue using a scan tool to confirm the P0031 code and identify the specific sensor causing the problem.
  2. Inspect the sensor's wiring and connections for any damage, corrosion, or loose connections.
  3. Test the sensor's heater circuit resistance to determine if the heater element is functioning properly.
  4. Replace the Oxygen Air-Fuel Ratio Sensor if it is found to be faulty.
  5. Clear the code and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0031 Toyota

The typical repair costs for addressing a P0031 code on a Toyota can range from $150 to $400, including parts and labor. However, actual costs may vary depending on the specific model of the vehicle, the location of the repair shop, and any additional diagnostic or repair work required. It's recommended to consult with a professional mechanic or auto repair shop for a more accurate estimate based on your individual circumstances.

Tech Notes for P0031 Toyota

There are Factory Service Bulletins for the following Toyota Models:

2004 Toyota Sienna
2004 Toyota Sienna Factory Service Bulletin OBDII Code P0031

2005–2007 Toyota Avalon
2007–2008 Toyota Camry
2005-2007 Toyota Avalon, 2007-2008 Toyota Camry Factory Service Bulletin OBDII Code P0031













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Information for Specific Toyota Models

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 Toyota Code

1. What is OBDII code P0031 for a Toyota?

- OBDII code P0031 for a Toyota refers to the Oxygen Air-Fuel Ratio Sensor Heater Control Circuit Low Bank 1 Sensor 1.

2. What are the common symptoms of OBDII code P0031 on a Toyota?

- Common symptoms of P0031 include reduced fuel efficiency, rough idling, and an illuminated check engine light.

3. What causes the Oxygen Air-Fuel Ratio Sensor Heater Control Circuit Low Bank 1 Sensor 1 code on a Toyota?

- The most common causes of P0031 in a Toyota are a faulty oxygen sensor, damaged wiring or connectors, or a blown fuse related to the sensor heater circuit.

4. How can I diagnose the issue related to OBDII code P0031 on my Toyota?

- Diagnose P0031 by checking the oxygen sensor's wiring and connections, testing the sensor's resistance, and inspecting the fuse for the sensor heater circuit.

5. Can I still drive my Toyota with OBDII code P0031 present?

- It is generally safe to drive with P0031, but it is important to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal fuel efficiency.

6. How can I repair OBDII code P0031 on my Toyota?

- Repair P0031 by replacing the Bank 1 Sensor 1 oxygen sensor, repairing any damaged wiring or connectors, and ensuring the fuse related to the sensor heater circuit is intact.

7. Does clearing the OBDII code P0031 on my Toyota reset the check engine light?

- Clearing the P0031 code will reset the check engine light, but if the underlying issue is not resolved, the code may reappear and the light will illuminate again.

8. Is it recommended to use OEM parts when replacing the oxygen sensor for P0031 on a Toyota?

- It is recommended to use OEM or high-quality aftermarket parts when replacing the oxygen sensor to ensure proper functionality and compatibility with your Toyota's system.

9. What are some preventive maintenance tips to avoid OBDII code P0031 on a Toyota?

- Regularly inspect and maintain your Toyota's oxygen sensors, wiring, and related components to prevent issues that could trigger the P0031 code.

10. Can a DIY enthusiast fix OBDII code P0031 on a Toyota, or is professional help recommended?

- DIY enthusiasts with automotive repair experience can often fix P0031 by following repair guides and using the right tools, but if unsure, seeking professional help is advisable.

Discuss the causes and fixes for P0031 Toyota OBDII Code

  • where is oxysen sensor bank 1 on toyota 4 runner 2007

  • What engine is on your 4Runner?

    First attached image is for the 6 cyl engine and second for the 4 cyl engine.

  • where is oxy,,sensor bank 1 o toyota tundra 8 cil,

  • What year?

  • where is O2 sensor heater circuit bank 1 sensor 1 TOYOTA 2000 land curoser 8V 4700

  • See attached image:

  • where is O2 sensor heater circuit bank 1 sensor 1 TOYOTA 2004 Tacoma V6 3.4

  • See attached image

  • image for camry 2004 v6 please

  • image for a 2003 Toyota Tacoma 3.4L V6 O2 sensor 1 Bank 1

  • my toyota land cruiser 2006 4700cc v8 we have a code engine no. P0171 SYSTEM TO LEAN Bank 1 , any help !!!!!!

  • where is an 02 sensor 1 bank 1 for a 2005 toyota camry code p0031

  • Here is the only image I have for the sensor. I hope it helps.

  • Here is the only image I have for the sensor for your 2005. I hope it helps.

  • 2003 Toyota Tacoma 3.4L V6 O2 Sensor Location. Please see the attached image.

  • where is p0031 bank 1 sensor for toyota sequoia 2004

  • Driver's side front.

  • Thanks for your info.

  • i am getting p0031 sensor1 bank 1 2004 toyota tundra dc 4.7 v8 what side is this on?

  • Driver side of the engine.

  • I have p0031 in my 07 Camry v6 were the sensor located?ty

  • Passenger side, on exhaust manifold, before the catalytic converter on.

  • Can anyone help me locate bank 1 sensor 1 for a 2007 Rav4 V6?

  • Is on the back of the engine.

  • Can anyone help me locate bank 1 sensor 1 for a 2005 Solara V6?

  • Sensor 1 Bank 1 is behind the engine, between the engine and the firewall.

  • Where would heated 02 sensor be on my 2007 avalon touring

  • Here is an image of the front oxygen sensors ( Air-Fuel Ratio (A/F) Sensor )

  • got a 09 sienna with code p0031. already replaced air fuel sensor and checked fuse in curcuit. what is the most likely cause or solution?

  • Usually the sensor takes care of the problem. Is there a chance that you may have replace the wrong side sensor? or the sensor you install was damage?

    If all it's OK, then you may have to have the dealer reprogram the ECM for you with the latest program. Other than the sensor, the program it's more like the cause.

  • Toyota Yaris, 2009, 1NR-FE, Engine code P0031 -> changed heated oxygen sensor 1, MIL again switch on - P0031.What is a problem, please?

  • Usually the sensor fix the problem. It's possible that the new sensor is damage. The sensors are very sensible and can easily get damage. If you or the part store drop the sensor, then it could be damage.

  • Changed the heated oxygen sensor 1 is Bosch. The heated circuit of this sensor is Ri=10,5 Ohm/20°C, Denso: Ri = 5,5-6,0 Ohm. The current of the heated circuit is set by ECU between 0,8 - 10 A. The resistance/600°C of Bosch sensor is higher than Denso and the current is lower than 0,8 A -> switch on MIL P0031.
    You are right, the sensor fix the problem, thank you.

  • Great information. Thanks for sharing

  • Looking for image of below in a 2003 Toyota Camry LE 4 cylinder and what parts are required for home install (if not recommended please explain) including socket
    Heated oxygen sensor
    Circuit low 1, sensor 1
    code P0031

  • Heres some typical dumb questions, if anyone can answer them :)
    I just bought a truck with a few things i need to get done to it. I'm def not a mechanic but have these codes coming up and was wondering if I should figured it out myself or take it in.
    ABS wheel speed sensors
    heated oxygen sensor P0031
    control circuit low
    bank 1 sensor
    I'm reading on some posts but usually when i have friends work on my vehicles something else breaks. Is this easy enough to just youtube and do myself, and what exactly do they mean... just sensors right?

  • What model and year is your Toyota? The P0031 code is easy to diagnose, usually replacing the sensor takes care of the problem. The ABS sensor is a bit more difficult to diagnose and I suggest to having a tech check that for you.

  • Thanks. I'm bringing it in actually. I found a fair priced mechanic. But it's a 2004.

  • Thanks to the excellent and beautiful site

  • 2004 4runner V6 Sport edition? O2 Heater control Circuit low B2S1(code) location? Thanks in advance.

  • I replaced the sensor with a new one on B1 S1 , looking at the engine 2011 Tacoma 4 x 4
    Bank 1 on left side ? Check engine light still on ? Sensor was the one in Front of Cat, started engine light still on. Removed and clean Neg Cable on battery , started engine light was off for a couple of seconds but came right back on ??
    Dealer print out says P0031 B1S1, maybe I put new sensor on wrong bank ?

  • Bank 1 is on the passenger side of the engine.

  • Toyota camry 2003 Code P0031
    I change new o2 sensor
    change ECU and Relay, fuse ,wire ,good
    but check Engine light still on ,
    How to fix ?

  • Let me see if I can find more information. Does your Camry have 4 (2.4) or 6 (3.0) cylinders? any exhaust leaks?

  • gday all, i just replaced the bank 1 sensor 1 plug on my 2004 4runner 6cyl and the code remains... but now after reading some info here its possible i replaced the wrong one. i swapped out the sensor on the drivers side closet to the engine. yay or nay? cheers!

  • The P0031 is for the #2 on the image below. (On the back of the engine). As far as I know (and according to my manual) both connectors are the same. If the connectors are the same, you should be able to swap the sensor.

    Image

    Click here to enlarge image

  • I have P0031 on 06 Avalon, which sensor and location? Part number?

  • The P0031 is for the Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 1, which is located on the back of the engine

    Image

    Click here to enlarge image

  • How about Toyota Hilux 2011 2.5L diesel, bank 1 sensor 1 location ?

  • image for a 2006 Toyota Avalon 3.4L V6 O2
    Bank 1 Sensor 1

  • image for a 2003 Toyota Avalon 3.4L V6 O2
    Bank 1 Sensor 1. I need a Link to purchase the sensor. [email protected]. thanks

  • Unfortunately, I do not have the part number or where to order. You must purchase the sensor at your local Toyota dealer. Here is the only image I got; I hope it helps.

    Image

    Click here to enlarge image