AutoCodes – Audi – P1129 Audi

P1129 Audi Code - Long Term Fuel Trim B2 System Too Rich

Quick Answer

The Engine Control Module (ECM) monitors the Long-Term Fuel Trim B2 System. Common causes include Faulty Oxygen Sensor, Faulty Mass Air Flow (MAF) Sensor, High fuel pressure. 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: P1129 Audi indicates Long Term Fuel Trim B2 System Too Rich.
Common causes: Common causes include Faulty Oxygen Sensor, Faulty Mass Air Flow (MAF) Sensor, High fuel pressure.
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.

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Code Popularity 13,090

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 19, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1129 Audi Description

The Engine Control Module (ECM) monitors the Long-Term Fuel Trim B2 System. The ECM sets the OBDII code when the Long-Term Fuel Trim B2 System is not to factory specifications.

OBDII Code P1129 Audi - Long Term Fuel Trim B2 System Too Rich - AutoCodes.com — P1129 Audi Code - Long Term Fuel Trim B2 System Too Rich

What does this mean?

What are the Possible Causes of the DTC P1129 Audi?

Faulty Oxygen Sensor
Faulty Mass Air Flow (MAF) Sensor
High fuel pressure
Canister purge solenoid stuck open
Oxygen Sensor harness is open or shorted
Oxygen Sensor circuit poor electrical connection

How to Fix the DTC P1129 Audi?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1129 Audi 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 P1129 Audi code?

Need more information on how to fix the P1129 Audi code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1129 Audi 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 P1129 Audi Code

1. What does OBDII code P1129 for Audi mean?

The OBDII code P1129 for Audi indicates that the Long Term Fuel Trim B2 System is too rich, meaning there is an excessive amount of fuel being supplied to the engine.

2. What are the common symptoms of OBDII code P1129 in an Audi?

Common symptoms of OBDII code P1129 in an Audi may include decreased fuel efficiency, rough idling, engine misfires, and the illumination of the check engine light.

3. What are the possible causes of OBDII code P1129 in an Audi?

Possible causes of OBDII code P1129 in an Audi may include a faulty oxygen sensor, a clogged fuel injector, a vacuum leak, a malfunctioning mass airflow sensor, or issues with the fuel pressure regulator.

4. How can I diagnose OBDII code P1129 in my Audi?

Diagnosing OBDII code P1129 in your Audi may involve using an OBDII scanner to retrieve the code, checking the oxygen sensor readings, inspecting the fuel injectors, and conducting a visual inspection for any visible leaks or damages in the fuel system.

5. What are the recommended repair tips for fixing OBDII code P1129 in an Audi?

Repair tips for fixing OBDII code P1129 in an Audi may include replacing a faulty oxygen sensor, cleaning or replacing clogged fuel injectors, repairing any vacuum leaks, cleaning or replacing the mass airflow sensor, or addressing any issues with the fuel pressure regulator.

6. Can I continue driving my Audi with OBDII code P1129 present?

It is not recommended to continue driving your Audi with OBDII code P1129 present, as it can lead to decreased fuel efficiency, engine performance issues, and potential long-term damage to the engine components.

7. How much does it typically cost to repair OBDII code P1129 in an Audi?

The cost of repairing OBDII code P1129 in an Audi can vary depending on the underlying cause of the issue, but it may range from a few hundred to a thousand dollars, including parts and labor.

8. How long does it take to fix OBDII code P1129 in an Audi?

The time it takes to fix OBDII code P1129 in an Audi can vary depending on the specific repair needed, but it may take a few hours to a full day for diagnosis and repair by a qualified mechanic.

9. Can I reset the check engine light after fixing OBDII code P1129 in my Audi?

Yes, once you have addressed the underlying issue causing OBDII code P1129 in your Audi, you can reset the check engine light using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

10. How can I prevent OBDII code P1129 from occurring in my Audi in the future?

To prevent OBDII code P1129 from occurring in your Audi in the future, it is essential to regularly maintain your vehicle, follow the recommended service schedule, use high-quality fuel, and address any engine performance issues promptly.