AutoCodes – Toyota – P0137 2001 Toyota Highlander

P0137 2001 Toyota Highlander Code - Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2

Quick Answer

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 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: P0137 2001 Toyota Highlander indicates Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 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 3,014

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 Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0137 2001 Toyota Highlander Description

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.

OBDII Code P0137 2001 Toyota Highlander - Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2 - AutoCodes.com — P0137 2001 Toyota Highlander Code - Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0137 2001 Toyota Highlander?

Faulty Rear Heated Oxygen Sensor Bank 1
Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

How to Fix the DTC P0137 2001 Toyota Highlander?

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 Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0137 2001 Toyota Highlander 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 2001 Toyota Highlander code?

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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 2001 Toyota Highlander Code

1. What are the common symptoms of OBDII code P0137 (2001 Toyota Highlander)?

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

2. What does the OBDII code P0137 in a 2001 Toyota Highlander indicate?

- The code P0137 signifies an Oxygen Sensor Circuit Low Voltage condition for Bank 1 Sensor 2 in the vehicle's exhaust system.

3. What are some possible causes of the Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2 code in a Toyota Highlander?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the engine's computer.

4. How can I diagnose the cause of OBDII code P0137 in my 2001 Toyota Highlander?

- Diagnosing the issue requires checking the oxygen sensor's wiring and connectors, inspecting for exhaust leaks, and using a scan tool to monitor sensor data.

5. Can I drive my Toyota Highlander with the P0137 code illuminated?

- It is generally safe to drive the vehicle with the code present, but it is recommended to address the underlying issue promptly to prevent potential damage to the engine or catalytic converter.

6. What steps can I take to repair the Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2 code in my 2001 Toyota Highlander?

- Repair steps may involve replacing the oxygen sensor, repairing damaged wiring, fixing exhaust leaks, or resetting the engine computer after addressing the issue.

7. How much does it typically cost to fix the P0137 code in a 2001 Toyota Highlander?

- The cost of repairs for code P0137 can vary depending on the root cause, but it may range from $100 for a simple sensor replacement to several hundred dollars for more complex repairs.

8. Will resetting the check engine light resolve the P0137 code in my Toyota Highlander?

- Resetting the check engine light may temporarily clear the code, but it will return if the underlying issue causing the fault is not addressed.

9. How important is it to address the Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2 code in my Toyota Highlander?

- It is essential to address the P0137 code promptly to ensure optimal engine performance, fuel efficiency, and to prevent potential damage to other components in the long run.

10. Can a DIY enthusiast repair the P0137 code issue in a 2001 Toyota Highlander?

- Depending on the root cause, a DIY enthusiast with the necessary tools and knowledge may be able to address the P0137 code by replacing the oxygen sensor or fixing wiring issues.