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P0037 Toyota Code - Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2

Quick Answer

The sensing portion of the heated oxygen sensor has a zirconia element which is used to detect the oxygen concentration in the exhaust gas. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2, Heated Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 2 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
P0037 Toyota indicates Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2.
Common causes
Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2, Heated Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 2 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 138,532
How popular is this code, among other codes? Medium
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Table of contents Created and updated by William Orellana on Aug 22, 2022
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Code P0037 Toyota Description

The sensing portion of the heated oxygen sensor has a zirconia element which is used to detect the oxygen concentration in the exhaust gas. If the zirconia element is at the appropriate temperature, and the difference between the oxygen concentrations surrounding the inside and outside surfaces of the sensor is large, the zirconia element generates voltage signals. In order to increase the oxygen concentration detecting capacity of the zirconia element, the Engine Control Module (ECM) supplements the heat from the exhaust with heat from a heating element inside the sensor.
The ECM monitors the current applied to the heated oxygen sensor heater to check the heater for malfunctions.
If the heater current is outside the normal range, the signal transmitted by the heated oxygen sensor becomes inaccurate. When the current in the heated oxygen sensor heater is outside the normal operating range, the ECM interprets this as a malfunction in the sensor heater and stores a Diagnostic Trouble Code (DTC).
OBDII Code P0037 Toyota - Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2 - AutoCodes.com
P0037 Toyota Code - Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2
What does this mean?

What are the Possible Causes of the DTC P0037 Toyota?

  • Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
  • Heated Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted
  • Heated Oxygen Sensor Bank 1 Sensor 2 circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P0037 Toyota?

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





User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0037 Toyota 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 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 P0037 Toyota Code

1. What are common symptoms of OBDII code P0037 in a Toyota?

- Common symptoms include poor fuel efficiency, rough idling, and the illumination of the check engine light.

2. What does the OBDII code P0037 Toyota indicate?

- The code indicates a malfunction in the Oxygen Sensor Heater Control Circuit for Bank 1 Sensor 2.

3. What are possible causes of the P0037 code in a Toyota?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, or a blown fuse related to the sensor.

4. How can I diagnose the cause of OBDII code P0037 in my Toyota?

- Diagnose the issue by checking the oxygen sensor's wiring and connectors, testing the sensor's resistance, and inspecting related fuses.

5. Can driving with the P0037 code unresolved cause further damage to my Toyota?

- Continuing to drive with the issue may result in poor engine performance and increased emissions, potentially leading to more severe problems over time.

6. How can I repair OBDII code P0037 in my Toyota?

- Repair options include replacing the faulty oxygen sensor, repairing damaged wiring or connectors, or replacing blown fuses related to the sensor.

7. Is it safe to drive my Toyota with the check engine light on due to code P0037?

- It is generally safe to drive the vehicle for a short period with the check engine light on, but it is recommended to address the issue promptly to prevent further damage.

8. Can a DIY enthusiast fix the P0037 code in a Toyota at home?

- Depending on the individual's skill level, DIY enthusiasts can attempt to fix the code by following repair guides and using the necessary tools and parts.

9. How much does it cost to repair OBDII code P0037 in a Toyota at a professional mechanic?

- The cost of repair can vary based on the exact cause of the issue, but it may range from $150 to $400, including parts and labor.

10. How often does the Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2 issue occur in Toyota vehicles?

- This issue can occur sporadically in Toyota vehicles and is not extremely common, but it is a known problem that may arise in certain models.

1. What are the common symptoms of OBDII code P0037 in a Toyota, indicating an Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2 issue?

- Common symptoms may include poor fuel economy, rough idling, engine misfires, and an illuminated check engine light.

2. What are the possible causes of the Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2 fault code (P0037) in a Toyota?

- The code P0037 in a Toyota can be triggered by a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or issues with the ECM.

3. How can I diagnose the Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2 problem in my Toyota?

- To diagnose P0037, you can use an OBDII scanner to read the code, visually inspect the oxygen sensor and its connections, check for damaged wiring, and test the sensor's heater circuit resistance.

4. What are some repair tips for addressing the P0037 code on a Toyota related to the oxygen sensor heater control circuit?

- Repair options may include replacing the faulty oxygen sensor, repairing damaged wiring or connectors, checking and replacing blown fuses, and clearing the error code with a scanner.

5. Can I drive my Toyota with the OBDII code P0037 (Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2) without causing further damage?

- It is not recommended to drive with the P0037 code active, as it can lead to decreased fuel efficiency and potentially harm the catalytic converter over time.

6. How much does it typically cost to repair the Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2 issue (code P0037) in a Toyota?

- The cost of repairing the P0037 code in a Toyota can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Is the Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2 fault common in Toyotas, and are there any recalls related to this issue?

- The P0037 code is a common issue in Toyotas and other vehicles. There have been no specific recalls related to this fault, but it is a known problem in some models.

8. Can I reset the check engine light after fixing the Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2 issue in my Toyota?

- Yes, you can reset the check engine light using an OBDII scanner after fixing the P0037 code. This will clear the error code and turn off the light.

9. How long does it take to repair the Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2 issue on a Toyota?

- The repair time for the P0037 code can vary depending on the exact cause of the problem and the technician's experience, but it typically takes around 1-2 hours to complete.

10. Can a DIY enthusiast with basic automotive skills fix the Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2 problem in a Toyota?

- Depending on the root cause, a DIY enthusiast may be able to address the P0037 code by replacing the oxygen sensor or checking for wiring issues. However, more complex repairs may require professional assistance.

Discuss the causes and fixes for P0037 Toyota OBDII Code

Submit a New Comment

  • I need to know the other name of heated oxygen sensor bank 1 sensor 2. Is this rear downstream on the right side?

    Reply to Comment

  • What model and year is your Toyota? Rear sensor is downstream, but the side or bank depends on the engine, model and year of your vehicle.

    Reply to Comment

  • It is a 2004 Toyota Sienna XLE Limited FWD. Does this help. I need to know the Denso replacement senor # as well if you could help with that. Appreciate your help.

    Reply to Comment

  • Don't have part numbers, but I have attached an image with the location. I hope it helps.

    Reply to Comment

  • Thanks! Unfortunately the Advanced Autoparts guys don't go by the diagram. I wonder if there is a way to see the replacement part number online. I think this is Denso 234-4516, but want to confirm. Otherwise will have to buy and show it to my auto shop. But thanks anyways....appreciate your help.

    Reply to Comment

  • I have a 06 Corolla that is giving a P0037 code I have replaced the Oxygen sensor closest to the Catalytic converter Twice, the first one was a Bosch, the second is a Denso, had the codes cleared and it is still throwing a P0037 code Help!!

    Reply to Comment

  • Did you replaced the sensor after or before the catalytic converter ? The P0037 code is for the one after the catalytic converter. Usually replacing the sensor takes care of the problem. If the codes still comes back after replacing the sensor, then the problem is the wire from the sensor to the engine control module (ECM)

    Reply to Comment

  • I have checked all my wires and the voltage at the ECU. I have taken all the ground wires off and cleaned them. I am still getting the P0037 codes. I had one day where the car ran terrible and gave me a P0172 and a P0303, so I cleaned the plugs, cleaned the MAF and the Throttle Body. Now I have an occasional P0420. Toyota says I have a bad Catalytic Converter. but the last week all I have gotten is a P0037. I purchased a scan tool to read live data. The Air Fuel Sensor is ranging from 3.0 - 3.33V the O2 Sensor ranges between .095 - .88 volts. when I look at two of the frozen data for the P0037 codes the ST Fuel Trim -13.3% and then 2% The LT Fuel Trim is 9.4% and then 3.1%

    Any thoughts??
    Thanks

    Reply to Comment

  • What model and year is your Toyota?

    Reply to Comment

  • 2006 Corolla S

    Reply to Comment

  • The P0037 code refers the heater part of the O2 sensor and not the O2 function. Usually the code is set when there is no power to the sensor (heater part) or the sensor heater circuit is open or shorted to ground.

    Reply to Comment

  • Here is another image with the problem circuit

    Reply to Comment

  • There is 12.5 Volts to the heater and I checked the resistance of the O2 heater,(the two black wires) and it was about 9.5 or 10 ohms, It was not an open circuit. I have taken all the ground wires off in the engine compartment and cleaned them and re tightened them.

    Reply to Comment

  • When the ECM send the heater circuit to ground (internally), it also measures the voltage drop of the circuit. By measuring the voltage drop of the circuit, the ECM can determine what the problem is (Circuit Low P0037 or Circuit High P0038).

    "Circuit Low" means that no voltage is getting to the ECM through the heater sensor circuit. Here are the possible causes:

    - No battery voltage to the sensor (You already check that and it's OK)
    - Open sensor circuit (You already check that and it's OK)
    - Broken wire from the O2 sensor to ECM
    - Faulty ECM

    I hope that helps.

    Reply to Comment

  • Ok, I will check that and let you know, Thank you very much!!

    Reply to Comment

  • I was wondering if you have a similar image for a 2007 Toyota Sienna V6. I'm replacing O2 Sensor Bank 1 Sensor 2 Code P0037 and need part location. Thanks in advance.

    Reply to Comment

  • Here is the only image I got. I hope it helps

    Image

    Click here to enlarge image

    Reply to Comment

  • Thanks so much. That does help.

    Reply to Comment

  • OK,this is for circuit low , what is the causes of circuit high p0038 ? (toyota yaris 2009).

    Reply to Comment

  • More than likely the Oxygen Sensor.

    P0038 TOYOTA - Oxygen Sensor Heater Control Circuit High Bank 1 Sensor 2

    Read more: https://www.autocodes.com/p...

    Reply to Comment

  • this is what appen to my car toyota camry 2003 i remove the battry tamina when I'm doing something there later i put the battry tamina back and now the car is stall tip off on the Road and scan i get p0352 p0031 p0037

    Reply to Comment

  • The O2 sensor should not cause the engine to stall. Since you have the P0352 code, then you may have a problem with the Ignition Coil.

    P0352 TOYOTA - Ignition Coil 2 Primary/Secondary Circuit
    Read more: https://www.autocodes.com/p...

    Reply to Comment

  • Hey read your discussion and it’s very helpful and I need your help; I have the P0037 heater control circuit low bank 1 sensor 2 for a 2013 Toyota Corolla and it has only 59k miles and the mechanic said that’s odd for it having so little miles. He mentioned a Diognostic / repair and a new sensor would be almost $300. I believe it’s a downstream sensor but I’m not sure what to do please help!!

    Reply to Comment

  • Yes, it is the downstream sensor. It's not odd for a sensor to fail in 5 year and almost 60K miles. It happens all the time. What is odd is the price, $300 is to high. A god aftermarket sensor with labor is around $200.

    Reply to Comment

  • I have a Toyota Land Cruiser 2003 4.7 Lt where can I find the information related to my model I can see Corolla Highlander and Prius I have found 2 of the sensors but told it has 4?

    Reply to Comment

  • Yes, there are 4 sensors. Two on each side of the engine, one before and one after the catalytic converter. Here is the only image I found. I hope that helps.

    Image

    Click here to enlarge image

    Reply to Comment

  • 1 hour of labor. lol The whole job takes about 5 minutes tops to do. I've done it before and am about to do it again. You're supposed to disconnect the battery, but I skipped that step. The plug for my car is by your right foot inside. Unplug it, unscrew it from the underside, it's right under that spot. Screw in the new one, put the plug through the hole, plug it in inside the car. Done.

    Reply to Comment

  • Thanks for sharing!!

    Reply to Comment
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