AutoCodes – Nissan – P0157 Nissan

P0157 Nissan Code - HO2S22 Circuit Low Voltage

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 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear Heated Oxygen Sensor Bank 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: P0157 Nissan indicates HO2S22 Circuit Low Voltage.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear Heated Oxygen Sensor Bank 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 18,523

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
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0157 Nissan 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 P0157 Nissan - HO2S22 Circuit Low Voltage - AutoCodes.com — P0157 Nissan Code - HO2S22 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0157 Nissan?

Faulty Rear Heated Oxygen Sensor Bank 2
Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

How to Fix the DTC P0157 Nissan?

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 2 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0157 Nissan 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 P0157 Nissan code?

Need more information on how to fix the P0157 Nissan code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0157 Nissan code diagnosed by a professional: Find a repair shop in your area

Information for Specific Nissan Models

P0157 2006 Nissan Maxima — HO2S22 Circuit Low Voltage
P0157 2007 Nissan Maxima — HO2S22 Circuit Low Voltage
P0157 2008 Nissan Maxima — HO2S22 Circuit Low Voltage
P0157 2006 Nissan Pathfinder — HO2S22 Circuit Low Voltage
P0157 2007 Nissan Pathfinder — HO2S22 Circuit Low Voltage
P0157 2008 Nissan Pathfinder — HO2S22 Circuit Low Voltage
P0157 2009 Nissan Pathfinder — HO2S22 Circuit Low Voltage
P0157 2010 Nissan Pathfinder — HO2S22 Circuit Low Voltage
P0157 2011 Nissan Pathfinder — HO2S22 Circuit Low Voltage
P0157 2012 Nissan Pathfinder — HO2S22 Circuit Low Voltage
P0157 2007 Nissan Sentra — HO2S22 Circuit Low Voltage
P0157 2008 Nissan Sentra — HO2S22 Circuit Low Voltage
P0157 2009 Nissan Sentra — HO2S22 Circuit Low Voltage
P0157 2010 Nissan Sentra — HO2S22 Circuit Low Voltage
P0157 2011 Nissan Sentra — HO2S22 Circuit Low Voltage
P0157 2012 Nissan Sentra — HO2S22 Circuit Low Voltage

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 P0157 Nissan Code

1. What are the common symptoms of OBDII code P0157 in a Nissan vehicle?

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

2. What does the OBDII code P0157 indicating a HO2S22 Circuit Low Voltage mean in a Nissan?

- This code indicates that the downstream oxygen sensor (HO2S22) in Bank 2 is detecting a voltage lower than normal levels.

3. What are the possible causes of the P0157 code in a Nissan?

- Common causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks near the sensor, or issues with the engine's air-fuel mixture.

4. How can I diagnose the P0157 code in my Nissan vehicle?

- Diagnosing the code involves using an OBDII scanner to read the code, inspecting the oxygen sensor and its connections, checking for exhaust leaks, and testing the sensor's voltage output.

5. Can I continue to drive my Nissan with the P0157 code present?

- It is not recommended to drive the vehicle with the P0157 code active, as it can lead to decreased fuel efficiency and potential engine performance issues.

6. How can I repair the P0157 code in my Nissan?

- Repair options include replacing the downstream oxygen sensor in Bank 2, repairing any damaged wiring or connectors, fixing exhaust leaks, and ensuring the proper air-fuel mixture.

7. Are there any DIY tips for fixing the P0157 code in a Nissan?

- While some may attempt to replace the oxygen sensor themselves, it is recommended to have a professional mechanic diagnose and repair the issue to ensure proper installation and functionality.

8. How much does it typically cost to repair the P0157 code in a Nissan?

- The cost of repairing the P0157 code can vary depending on the underlying cause, but it may range from $150 to $400, including parts and labor.

9. Will resetting the Check Engine Light clear the P0157 code in my Nissan?

- Resetting the Check Engine Light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return after driving the vehicle for a short period.

10. Can a P0157 code in a Nissan be triggered by other related issues?

- Yes, issues such as a faulty catalytic converter, vacuum leaks, or problems with the engine's fuel system can sometimes trigger the P0157 code along with other related codes.