Engine-Codes.com
Engine-Codes – Saturn – P0139 Saturn

P0139 Saturn Code - HO2S Slow Response Bank 1 Sensor 2

Quick Answer

The P0139 code for Saturn vehicles indicates a slow response from the oxygen sensor located downstream of the catalytic converter on Bank 1. Common causes include Faulty oxygen sensor, Wiring or connector issues, Exhaust leaks near the sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0139 Saturn indicates HO2S Slow Response Bank 1 Sensor 2.
Common causes
Common causes include Faulty oxygen sensor, Wiring or connector issues, Exhaust leaks near the sensor.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0139 Saturn Description

The P0139 code for Saturn vehicles indicates a slow response from the oxygen sensor located downstream of the catalytic converter on Bank 1. This sensor, known as the HO2S (Heated Oxygen Sensor), is responsible for monitoring the oxygen levels in the exhaust gases to ensure the engine is running efficiently. A slow response from this sensor can lead to decreased fuel efficiency, increased emissions, and potential damage to the catalytic converter over time. This issue can also trigger the check engine light to illuminate on the dashboard.

OBDII Code P0139 Saturn - HO2S Slow Response Bank 1 Sensor 2
P0139 Saturn Code - HO2S Slow Response Bank 1 Sensor 2

Common Causes of P0139 Saturn

  1. Faulty oxygen sensor
  2. Wiring or connector issues
  3. Exhaust leaks near the sensor
  4. Engine running too rich or too lean
  5. Catalytic converter malfunction

Symptoms of P0139 Saturn

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Engine hesitation or misfiring
  4. Increased emissions
  5. Check engine light illuminated

How to Fix P0139 Saturn

  1. Diagnose the issue by using a scan tool to determine the exact cause of the slow response.
  2. Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as necessary.
  3. Test the oxygen sensor's functionality and replace it if it is faulty.
  4. Check for exhaust leaks near the sensor and repair any leaks found.
  5. If all else fails, consult a professional mechanic to diagnose and repair any underlying engine or catalytic converter issues.

Cost to Fix P0139 Saturn

The typical cost to repair a P0139 code can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor in your area. Keep in mind that additional diagnostic time may be needed to pinpoint the exact problem, and labor rates can vary between different auto repair shops. It is recommended to get quotes from multiple shops to ensure you are getting a fair price for the repair.

Need more information about the P0139 Saturn code?

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

Need Help with the Code?

Get the P0139 Saturn code diagnosed by a professional: Find a repair shop in your area

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 Saturn Code

1. What does the OBDII code P0139 mean on a Saturn?

P0139 indicates that the downstream oxygen sensor (Bank 1, Sensor 2) is responding slower than expected to changes in the air-fuel mixture.

2. What are the symptoms of a P0139 code on a Saturn?

Common symptoms include reduced fuel efficiency, a check engine light, rough idling, and sometimes increased emissions.

3. What causes the P0139 code on a Saturn?

Potential causes include a faulty oxygen sensor, exhaust leaks, wiring or connector issues, or a buildup of carbon deposits on the sensor.

4. Can I drive my Saturn with the P0139 code?

While your car may still be drivable, ignoring the code could lead to worsened fuel economy and potential damage to the catalytic converter over time.

5. How do I fix the P0139 code on a Saturn?

Common fixes include replacing the downstream oxygen sensor, repairing damaged wiring or connectors, and checking for exhaust leaks.

6. How do I diagnose the P0139 code on a Saturn?

Diagnosis typically involves scanning for additional codes, inspecting the oxygen sensor and its wiring, and testing the sensor's response time with a diagnostic tool.

7. How much does it cost to repair a P0139 code on a Saturn?

Replacing the oxygen sensor typically costs $150 to $300, depending on labor rates and the sensor's price.

8. Can a dirty oxygen sensor cause the P0139 code on a Saturn?

Yes, carbon buildup on the oxygen sensor can slow its response time and trigger the P0139 code.

9. What tools do I need to fix the P0139 code on a Saturn?

You’ll need an OBDII scanner, a socket set, and possibly a specialized oxygen sensor socket to replace the sensor.

10. Will resetting the check engine light fix the P0139 code on a Saturn?

Resetting the light may temporarily clear the code, but if the underlying issue isn’t addressed, the code will return.

Discuss the causes and fixes for P0139 Saturn OBDII Code

Submit a New Comment

Code P0139 Saturn comments

No comments found for this page.