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Engine-Codes – Audi – P1139 Audi

P1139 Audi Code - Long Term Fuel Trim Add. Fuel B2 System Too Rich

Quick Answer

The P1139 OBD-II trouble code for Audi specifically refers to the Long Term Fuel Trim Additive Fuel Bank 2 System being too rich. Common causes include Faulty oxygen sensor, Vacuum leak, Malfunctioning fuel injector. 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
P1139 Audi indicates Long Term Fuel Trim Add. Fuel B2 System Too Rich.
Common causes
Common causes include Faulty oxygen sensor, Vacuum leak, Malfunctioning fuel injector.
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 Sep 08, 2024
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Code P1139 Audi Description

The P1139 OBD-II trouble code for Audi specifically refers to the Long Term Fuel Trim Additive Fuel Bank 2 System being too rich. This means that the engine's computer has detected that the air-fuel mixture being delivered to the engine's cylinders is too rich, meaning there is too much fuel and not enough air. This can lead to a variety of issues with the vehicle's performance and efficiency.

OBDII Code P1139 Audi - Long Term Fuel Trim Add. Fuel B2 System Too Rich
P1139 Audi Code - Long Term Fuel Trim Add. Fuel B2 System Too Rich

Common Causes of P1139 Audi

  1. Faulty oxygen sensor
  2. Vacuum leak
  3. Malfunctioning fuel injector
  4. Dirty air filter
  5. Problem with the fuel pressure regulator

Symptoms of P1139 Audi

  1. Decreased fuel economy
  2. Rough idling or stalling
  3. Engine misfires
  4. Strong fuel odor from the exhaust
  5. Check Engine Light illuminated

How to Fix P1139 Audi

  1. Diagnose the issue using an OBD-II scanner to confirm the P1139 code
  2. Inspect the oxygen sensor, vacuum lines, fuel injectors, air filter, and fuel pressure regulator for any issues
  3. Replace any faulty components, such as a worn-out oxygen sensor or clogged fuel injector
  4. Clear the trouble code from the engine's computer and test drive the vehicle to ensure the issue has been resolved
  5. If the problem persists, further diagnostics may be needed to identify the root cause of the rich fuel mixture

Cost to Fix P1139 Audi

The typical repair costs for addressing a P1139 code can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check with local repair shops for a more accurate estimate.

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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 P1139 Audi Code

1. What does the OBDII code P1139 mean on an Audi?

P1139 indicates that the long-term fuel trim on Bank 2 is too rich, meaning the engine control unit (ECU) detects an excessive amount of fuel compared to air in the combustion process.

2. What are the symptoms of code P1139 in an Audi?

Common symptoms include poor fuel economy, rough idling, black smoke from the exhaust, difficulty starting the engine, and potentially an illuminated check engine light.

3. What causes the P1139 code to be triggered?

The code can be caused by a faulty fuel injector, a malfunctioning oxygen sensor, a vacuum leak, a dirty mass airflow sensor (MAF), or a problem with the fuel pressure regulator.

4. Can a bad oxygen sensor cause the P1139 code in an Audi?

Yes, a faulty oxygen sensor on Bank 2 can send incorrect readings to the ECU, leading to improper fuel mixture adjustments and triggering the P1139 code.

5. How do I diagnose the P1139 code on my Audi?

Diagnosis typically involves checking for vacuum leaks, inspecting the oxygen sensors and fuel injectors, testing the mass airflow sensor, and verifying proper fuel pressure.

6. Is it safe to drive an Audi with the P1139 code?

Driving with the P1139 code is not recommended, as it can lead to poor engine performance, damage to the catalytic converter, and increased emissions if left unresolved.

7. How can I fix the P1139 code on my Audi?

Repairs may include cleaning or replacing the mass airflow sensor, replacing faulty oxygen sensors, repairing vacuum leaks, or servicing the fuel injectors.

8. Can a dirty mass airflow sensor cause the P1139 code?

Yes, a dirty or malfunctioning mass airflow sensor can provide incorrect air intake readings, causing the ECU to add too much fuel and trigger the P1139 code.

9. How much does it cost to repair the P1139 code?

Repair costs vary depending on the root cause but can range from $150 to $500 or more, depending on whether parts like oxygen sensors or injectors need replacement.

10. Can I clear the P1139 code without fixing the issue?

Clearing the code without addressing the underlying problem may temporarily turn off the check engine light, but the code is likely to return until the issue is properly resolved.

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