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P0137 Toyota Code - Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2

Quick Answer

In order to obtain a high purification rate of the Carbon Monoxide (CO), Hydrocarbon (HC), and Nitrogen Oxide (NOx) components in the exhaust gas, a Three-Way Catalytic Converter (TWC) is used. Common causes include Faulty Oxygen Sensor Bank 1 Sensor 2, Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted, 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
P0137 Toyota indicates Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2.
Common causes
Common causes include Faulty Oxygen Sensor Bank 1 Sensor 2, Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted, 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 69,506
How popular is this code, among other codes? Medium
What is this?
Table of contents Created and updated by William Orellana on Aug 24, 2022
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Code P0137 Toyota Description

In order to obtain a high purification rate of the Carbon Monoxide (CO), Hydrocarbon (HC), and Nitrogen Oxide (NOx) components in the exhaust gas, a Three-Way Catalytic Converter (TWC) is used. For the most efficient use of the TWC, the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric air-fuel level. For the purpose of helping the Engine Control Module (ECM) to deliver accurate air-fuel ratio control, a heated oxygen sensor is used.
The heated oxygen sensor is located behind the TWC and detects the oxygen concentration in the exhaust gas. Since the sensor is integrated with the heater that heats the sensing portion, it is possible to detect the oxygen concentration even when the intake air volume is low (the exhaust gas temperature is low).
When the air-fuel ratio becomes lean, the oxygen concentration in the exhaust gas is high. The heated oxygen sensor informs the ECM that the post-TWC air-fuel ratio is lean (low voltage, i.e. less than 0.45 V).
Conversely, when the air-fuel ratio is richer than the stoichiometric air-fuel level, the oxygen concentration in the exhaust gas is low. The heated oxygen sensor informs the ECM that the post-TWC air-fuel ratio is rich (high voltage, i.e. more than 0.45 V). The heated oxygen sensor has the property of changing its output voltage drastically when the air-fuel ratio is close to the stoichiometric level.
The ECM uses the supplementary information from the heated oxygen sensor to determine whether the air-fuel ratio after the TWC is rich or lean and adjusts the fuel injection duration accordingly. Thus, if the heated oxygen sensor is working improperly due to internal malfunctions, the ECM is unable to compensate for deviations in the primary air-fuel ratio control.
The impedance cannot be measured using an ohmmeter. Diagnostic Trouble Code (DTC) P0137 indicates an open or short circuit in the heated oxygen sensor (2 driving cycles). The ECM stores the DTC when the impedance of the sensor exceeds the threshold 15 kΩ.
OBDII Code P0137 Toyota - Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2 - AutoCodes.com
P0137 Toyota Code - Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2
What does this mean?

What are the Possible Causes of the DTC P0137 Toyota?

  • Faulty Oxygen Sensor Bank 1 Sensor 2
  • Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted
  • Oxygen Sensor Bank 1 Sensor 2 circuit poor electrical connection
  • Gas leak from exhaust system

How to Fix the DTC P0137 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

Replacing the Oxygen Sensor Bank 1 Sensor 2 (Rear Oxygen Sensor Bank 1 or Downstream Oxygen Sensor Bank 1) usually takes care of the problem.





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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0137 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.

Need more information about the P0137 Toyota code?

Need more information on how to fix the P0137 Toyota code? Get Access to Factory Service Manuals

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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 P0137 Toyota Code

1. What are the common symptoms of OBDII code P0137 for a Toyota?

The common symptoms include poor fuel economy, rough idling, engine misfires, and illuminated Check Engine Light.

2. What causes the OBDII code P0137 in a Toyota?

The code P0137 typically indicates a malfunction in the oxygen sensor circuit of Bank 1 Sensor 2, which could be caused by a faulty oxygen sensor, wiring issues, or a problem with the engine's computer.

3. How serious is the OBDII code P0137 in a Toyota?

While the code itself may not cause immediate harm to the vehicle, ignoring it can lead to decreased fuel efficiency and potential damage to the catalytic converter over time.

4. Can I still drive my Toyota with the OBDII code P0137?

It is generally safe to drive the vehicle with the code P0137, but it is recommended to address the underlying issue as soon as possible to prevent further complications.

5. How can I diagnose the OBDII code P0137 in my Toyota?

Diagnosing the code usually involves checking the oxygen sensor's voltage readings, inspecting the sensor and its wiring for damage, and using a scan tool to monitor sensor data.

6. Is it possible to repair the OBDII code P0137 in a Toyota myself?

Depending on your skill level and access to tools, you may be able to replace the oxygen sensor or repair the wiring yourself. However, seeking professional help is recommended for an accurate diagnosis and proper repair.

7. What is the typical cost to repair the OBDII code P0137 in a Toyota?

The cost of repair can vary depending on the cause of the issue, but it usually ranges from $100 to $300 for parts and labor when replacing the oxygen sensor.

8. How long does it take to fix the OBDII code P0137 in a Toyota?

Repairing the code P0137 can typically be done within a few hours, but it may take longer if additional troubleshooting is required to pinpoint the exact cause of the problem.

9. Can a dirty air filter cause the OBDII code P0137 in a Toyota?

While a dirty air filter can affect engine performance, it is not a direct cause of the code P0137. Focus on inspecting the oxygen sensor and related components for issues.

10. Will resetting the Check Engine Light resolve the OBDII code P0137 in a Toyota?

Resetting the light may temporarily turn it off, but if the underlying issue causing the code is not addressed, the light will likely come back on. It's important to diagnose and fix the root cause of the problem.

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