AutoCodes – Nissan – P0139 2006 Nissan Altima Sedan

P0139 2006 Nissan Altima Sedan 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 2006 Nissan Altima Sedan 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.

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Code Popularity 3,519

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 P0139 2006 Nissan Altima Sedan 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 P0139 2006 Nissan Altima Sedan - HO2S12 Slow Response - AutoCodes.com — P0139 2006 Nissan Altima Sedan Code - HO2S12 Slow Response

What does this mean?

What are the Possible Causes of the DTC P0139 2006 Nissan Altima Sedan?

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 2006 Nissan Altima Sedan?

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 P0139 2006 Nissan Altima Sedan 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 P0139 2006 Nissan Altima Sedan Code

1. What does the OBDII code P0139 on a 2006 Nissan Altima Sedan indicate?

- The code P0139 specifically refers to a slow response by the HO2S12 sensor, also known as the downstream oxygen sensor.

2. What are the common symptoms of a P0139 code in a 2006 Nissan Altima Sedan?

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

3. What are the possible causes of a P0139 code in a 2006 Nissan Altima Sedan?

- Potential causes include a faulty HO2S12 sensor, wiring issues, exhaust leaks, engine misfires, or a problem with the catalytic converter.

4. How can I diagnose the source of a P0139 code in a 2006 Nissan Altima Sedan?

- Diagnosing the issue involves checking the downstream oxygen sensor's wiring, testing its response time, inspecting for exhaust leaks, and scanning for any other related trouble codes.

5. Can I still drive my 2006 Nissan Altima Sedan with a P0139 code?

- It is generally safe to drive the vehicle for a short distance with a P0139 code, but prolonged driving with a faulty oxygen sensor can lead to decreased fuel efficiency and potential damage to the catalytic converter.

6. How can I repair a P0139 code on my 2006 Nissan Altima Sedan?

- Repair options include replacing the HO2S12 sensor, repairing any damaged wiring, fixing exhaust leaks, addressing engine misfires, and ensuring the catalytic converter is functioning properly.

7. Will resetting the check engine light resolve the P0139 code on a 2006 Nissan Altima Sedan?

- Simply resetting the check engine light may temporarily clear the code, but the underlying issue causing the P0139 code will need to be properly diagnosed and repaired to prevent it from reoccurring.

8. How much does it typically cost to repair a P0139 code on a 2006 Nissan Altima Sedan?

- The cost of repairing a P0139 code can vary depending on the specific issue, but it may range from $100 to $400 for parts and labor, with sensor replacement being a common repair.

9. Can a DIY enthusiast fix a P0139 code on a 2006 Nissan Altima Sedan?

- While some aspects of diagnosing and repairing a P0139 code can be tackled by DIY enthusiasts, it is recommended to have a professional mechanic perform the repair to ensure proper diagnosis and a successful fix.

10. How often does a P0139 code occur in a 2006 Nissan Altima Sedan?

- The occurrence of a P0139 code can vary depending on the vehicle's condition and maintenance history, but it is a relatively common issue that may arise as the vehicle ages.