AutoCodes – Hyundai – P0139 Hyundai

P0139 Hyundai Code - HO2S Circuit Slow Response 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: P0139 Hyundai indicates HO2S Circuit Slow Response 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 55,691

How popular is this code, among other codes? Medium

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 Apr 12, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0139 Hyundai 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.

2002 Hyundai Elantra Sensor Location

OBDII Code P0139 Hyundai - HO2S Circuit Slow Response Bank 1 Sensor 2 - AutoCodes.com — P0139 Hyundai Code - HO2S Circuit Slow Response Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0139 Hyundai?

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 Hyundai?

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 Hyundai 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 P0139 Hyundai code?

Need more information on how to fix the P0139 Hyundai code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Hyundai Models

P0139 2002 Hyundai Elantra — HO2S Circuit Slow Response Bank 1 Sensor 2

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 Hyundai Code

1. What are the common symptoms of OBDII code P0139 on a Hyundai?

The common symptoms of code P0139 include poor fuel efficiency, rough idling, and hesitation during acceleration.

2. What does the HO2S Circuit Slow Response Bank 1 Sensor 2 code mean for a Hyundai?

The code P0139 indicates that the oxygen sensor downstream of the catalytic converter in bank 1 is responding slowly.

3. What are the possible causes of OBDII code P0139 on a Hyundai?

Possible causes of code P0139 include a faulty oxygen sensor, wiring issues, exhaust leaks, or a malfunctioning catalytic converter.

4. How can I diagnose the OBDII code P0139 on my Hyundai?

Diagnosing code P0139 involves checking the oxygen sensor's wiring, inspecting for exhaust leaks, and testing the sensor's response time using a scan tool.

5. Can a dirty or contaminated sensor cause code P0139 on a Hyundai?

Yes, a dirty or contaminated oxygen sensor can cause slow response times and trigger code P0139 on a Hyundai.

6. What is the recommended repair for OBDII code P0139 on a Hyundai?

The recommended repair for code P0139 is to replace the oxygen sensor in bank 1 sensor 2 if testing confirms it is faulty.

7. Are there any DIY tips for fixing OBDII code P0139 on a Hyundai?

DIY tips for fixing code P0139 include checking and cleaning the sensor's wiring connections, ensuring proper installation, and clearing the code with a scan tool.

8. Can driving with OBDII code P0139 on a Hyundai cause further damage?

Continuing to drive with code P0139 may lead to decreased fuel efficiency and potential damage to the catalytic converter over time.

9. How long does it typically take to repair OBDII code P0139 on a Hyundai?

Repairing code P0139 on a Hyundai can take anywhere from 30 minutes to an hour, depending on the location of the oxygen sensor and the ease of access.

10. Is it safe to drive my Hyundai with the check engine light on due to code P0139?

While it may be safe to drive short distances with code P0139, it is recommended to address the issue promptly to prevent potential long-term damage and ensure optimal vehicle performance.