P0139 Nissan Code - HO2S12 Slow Response
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
- P0139 Nissan indicates HO2S12 Slow Response.
- 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.
Code P0139 Nissan Description
What are the Possible Causes of the DTC P0139 Nissan?
- 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 P0139 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0139 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.
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Information for Specific Nissan Models
- P0139 2002 Nissan Altima Sedan — HO2S12 Slow Response
- P0139 2003 Nissan Altima Sedan — HO2S12 Slow Response
- P0139 2004 Nissan Altima Sedan — HO2S12 Slow Response
- P0139 2005 Nissan Altima Sedan — HO2S12 Slow Response
- P0139 2006 Nissan Altima Sedan — HO2S12 Slow Response
- P0139 2008 Nissan Altima Sedan — HO2S12 Slow Response
- P0139 2009 Nissan Altima Sedan — HO2S12 Slow Response
- P0139 2010 Nissan Altima Sedan — HO2S12 Slow Response
- P0139 2011 Nissan Altima Sedan — HO2S12 Slow Response
- P0139 2012 Nissan Altima Sedan — HO2S12 Slow Response
- P0139 2004 Nissan Maxima — HO2S12 Slow Response
- P0139 2005 Nissan Maxima — HO2S12 Slow Response
- P0139 2006 Nissan Maxima — HO2S12 Slow Response
- P0139 2007 Nissan Maxima — HO2S12 Slow Response
- P0139 2008 Nissan Maxima — HO2S12 Slow Response
- P0139 2005 Nissan Pathfinder — HO2S12 Slow Response
- P0139 2006 Nissan Pathfinder — HO2S12 Slow Response
- P0139 2007 Nissan Pathfinder — HO2S12 Slow Response
- P0139 2008 Nissan Pathfinder — HO2S12 Slow Response
- P0139 2009 Nissan Pathfinder — HO2S12 Slow Response
- P0139 2010 Nissan Pathfinder — HO2S12 Slow Response
- P0139 2011 Nissan Pathfinder — HO2S12 Slow Response
- P0139 2012 Nissan Pathfinder — HO2S12 Slow Response
- P0139 2008 Nissan Rogue — HO2S12 Slow Response
- P0139 2009 Nissan Rogue — HO2S12 Slow Response
- P0139 2010 Nissan Rogue — HO2S12 Slow Response
- P0139 2011 Nissan Rogue — HO2S12 Slow Response
- P0139 2012 Nissan Rogue — HO2S12 Slow Response
- P0139 2013 Nissan Rogue — HO2S12 Slow Response
- P0139 2002 Nissan Sentra — HO2S12 Slow Response
- P0139 2003 Nissan Sentra — HO2S12 Slow Response
- P0139 2004 Nissan Sentra — HO2S12 Slow Response
- P0139 2005 Nissan Sentra — HO2S12 Slow Response
- P0139 2006 Nissan Sentra — HO2S12 Slow Response
- P0139 2007 Nissan Sentra — HO2S12 Slow Response
- P0139 2008 Nissan Sentra — HO2S12 Slow Response
- P0139 2009 Nissan Sentra — HO2S12 Slow Response
- P0139 2010 Nissan Sentra — HO2S12 Slow Response
- P0139 2011 Nissan Sentra — HO2S12 Slow Response
- P0139 2012 Nissan Sentra — HO2S12 Slow Response
Frequently Asked Questions about P0139 Nissan Code
1. What are the common symptoms of OBDII code P0139 for a Nissan vehicle?
- Common symptoms include poor fuel economy, rough idling, and the illumination of the Check Engine light.
2. What does the OBDII code P0139 for a Nissan indicate?
- This code indicates a slow response from the downstream oxygen sensor (HO2S12) in the exhaust system.
3. What are the possible causes of OBDII code P0139 in a Nissan?
- Possible causes include a faulty oxygen sensor, wiring issues, exhaust system leaks, or an engine misfire.
4. How can I diagnose the root cause of OBDII code P0139 in my Nissan?
- A diagnostic scan tool can help pinpoint the issue by monitoring sensor data and checking for any related trouble codes.
5. Can a dirty or contaminated oxygen sensor cause code P0139 in a Nissan?
- Yes, a dirty or contaminated oxygen sensor can lead to a slow response and trigger OBDII code P0139.
6. What is the recommended repair for OBDII code P0139 on a Nissan?
- The typical repair involves replacing the downstream oxygen sensor (HO2S12) and addressing any underlying issues causing the slow response.
7. Is it safe to continue driving my Nissan with OBDII code P0139 illuminated?
- While the vehicle may still be driveable, it is recommended to address the issue promptly to prevent potential damage to the catalytic converter.
8. Can a DIY enthusiast fix OBDII code P0139 on a Nissan?
- Depending on their skill level, a DIY enthusiast may be able to replace the downstream oxygen sensor themselves to resolve the issue.
9. Will resetting the Check Engine light resolve OBDII code P0139 in a Nissan?
- Resetting the light will clear the immediate indication, but the underlying issue causing the code will need to be addressed to prevent its return.
10. How often should the oxygen sensors be inspected in a Nissan to prevent OBDII code P0139?
- It is recommended to inspect and replace oxygen sensors according to the manufacturer's maintenance schedule to prevent issues like code P0139.
Discuss the causes and fixes for P0139 Nissan OBDII Code
-
The post cat O2 sensor (B1S2) should not switch. It is used to monitor catalyst efficiency. However the ECM will look at how fast the sensor will reach a certain voltage to determine if it is working. P0139 will set if the O2 does not rich this certain voltage in a certain amount of time. Let's say the O2 heater is not working. It would take the O2 too long to reach this predetermined condition and set P0139. You're welcome, Rick Biegler CMAT L1
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