AutoCodes – Infiniti – P0137 Infiniti

P0137 Infiniti Code - Heated 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 Infiniti indicates Heated 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 10,215

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 Infiniti 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 Infiniti - Heated Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2 - AutoCodes.com — P0137 Infiniti Code - Heated Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0137 Infiniti?

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 Infiniti?

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 Infiniti 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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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 Infiniti Code

1. What are the common symptoms of OBDII code P0137 in an Infiniti?

- Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the Check Engine Light.

2. What does "Heated Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2" mean in relation to code P0137 in an Infiniti?

- This indicates that the oxygen sensor downstream of the catalytic converter in bank 1 is not operating properly due to low voltage.

3. What are some possible causes of code P0137 in an Infiniti?

- Potential causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, fuel system issues, or a malfunctioning engine control module.

4. How can I diagnose the cause of OBDII code P0137 in my Infiniti?

- Diagnosing the issue may involve using a scan tool to monitor sensor data, conducting a visual inspection of the sensor and its wiring, and performing tests to check for proper voltage levels.

5. Can I continue driving my Infiniti with OBDII code P0137 present?

- It is generally not recommended to drive with this code active, as it can lead to decreased fuel efficiency and potential damage to the catalytic converter over time.

6. How can I repair OBDII code P0137 in my Infiniti?

- Repair options may include replacing the oxygen sensor, repairing damaged wiring, fixing exhaust leaks, addressing fuel system issues, or reprogramming the engine control module.

7. Are there any DIY tips for resolving code P0137 in an Infiniti?

- DIY enthusiasts can start by checking the sensor's wiring for damage, ensuring proper sensor connections, and performing a visual inspection of the exhaust system for leaks.

8. How much does it typically cost to fix OBDII code P0137 in an Infiniti?

- The cost of repairs can vary depending on the exact cause of the issue, but it may range from $100 for a DIY repair to $300-$500 at a repair shop for parts and labor.

9. Will resetting the Check Engine Light make OBDII code P0137 go away in my Infiniti?

- Resetting the light may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to return after driving a certain distance.

10. How important is it to address OBDII code P0137 promptly in an Infiniti?

- It is important to address this code promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance and fuel efficiency.