AutoCodes – Toyota – P0137 2003 Toyota Highlander

P0137 2003 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 2003 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 3,433

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 2003 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 2003 Toyota Highlander - Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2 - AutoCodes.com — P0137 2003 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 2003 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 2003 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 2003 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 2003 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 2003 Toyota Highlander Code

1. What does the OBDII code P0137 for a 2003 Toyota Highlander mean?

The code P0137 indicates that the oxygen sensor circuit for Bank 1 Sensor 2 is registering a low voltage condition.

2. What are the common symptoms of a P0137 code in a 2003 Toyota Highlander?

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

3. What are the possible causes of a P0137 code on a 2003 Toyota Highlander?

Potential causes include a faulty oxygen sensor, damaged wiring or connectors in the sensor circuit, exhaust leaks, or issues with the engine's fuel system.

4. How can I diagnose a P0137 code on my 2003 Toyota Highlander?

Diagnosing a P0137 code typically involves using a scan tool to monitor the oxygen sensor's voltage readings and inspecting the sensor, wiring, and connectors for any visible damage.

5. Can I continue driving my 2003 Toyota Highlander with a P0137 code?

While it may be possible to drive with a P0137 code, it is not recommended as it can lead to decreased fuel efficiency and potential damage to the catalytic converter over time.

6. How can I repair a P0137 code on my 2003 Toyota Highlander?

Repairing a P0137 code often involves replacing the Bank 1 Sensor 2 oxygen sensor, repairing any damaged wiring or connectors, and clearing the code with a scan tool.

7. Are there any DIY tips for fixing a P0137 code on a 2003 Toyota Highlander?

DIY tips include checking for loose or damaged wiring, ensuring the oxygen sensor is securely connected, and using a multimeter to test the sensor's voltage output.

8. How much does it typically cost to fix a P0137 code on a 2003 Toyota Highlander?

The cost to fix a P0137 code can vary depending on the exact cause, but it may range from $100 to $300 for parts and labor at a repair shop.

9. Will a P0137 code cause my 2003 Toyota Highlander to fail an emissions test?

Yes, a P0137 code can cause your vehicle to fail an emissions test due to improper oxygen sensor readings affecting the vehicle's emissions levels.

10. How can I prevent a P0137 code from recurring on my 2003 Toyota Highlander?

To prevent a P0137 code from coming back, make sure to use high-quality oxygen sensors, perform regular maintenance on your vehicle, and address any engine issues promptly.