AutoCodes – Audi – P1165 Audi

P1165 Audi Code - Bank 1 Long Term Fuel Trim Range 1 Rich Upper Limits Exceeded

Quick Answer

P1165 Audi indicates Bank 1 Long Term Fuel Trim Range 1 Rich Upper Limits Exceeded. Common causes include High fuel pressure-Blocked return system or failed pressure regulator, Faulty fuel injector, EVAP purge solenoid stuck open. 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: P1165 Audi indicates Bank 1 Long Term Fuel Trim Range 1 Rich Upper Limits Exceeded.
Common causes: Common causes include High fuel pressure-Blocked return system or failed pressure regulator, Faulty fuel injector, EVAP purge solenoid stuck open.
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 3,996

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

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Table of contents Created and updated by William Orellana on May 04, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1165 Audi Description

OBDII Code P1165 Audi - Bank 1 Long Term Fuel Trim Range 1 Rich Upper Limits Exceeded - AutoCodes.com — P1165 Audi Code - Bank 1 Long Term Fuel Trim Range 1 Rich Upper Limits Exceeded

What does this mean?

What are the Possible Causes of the DTC P1165 Audi?

High fuel pressure-Blocked return system or failed pressure regulator
Faulty fuel injector
EVAP purge solenoid stuck open
Cylinder misfire
Correct other codes first

How to Fix the DTC P1165 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 P1165 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 P1165 Audi code?

Need more information on how to fix the P1165 Audi code? Get Access to Factory Service Manuals

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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 P1165 Audi Code

1. What does the OBDII code P1165 mean on an Audi?

P1165 indicates that the long-term fuel trim for Bank 1 has exceeded the upper limit, meaning the engine is running too rich for an extended period.

2. What are the common symptoms of P1165 in an Audi?

Symptoms may include poor fuel economy, rough idle, black smoke from the exhaust, reduced engine performance, and the check engine light turning on.

3. What causes the P1165 code on an Audi?

Common causes include a faulty oxygen sensor, a leaking fuel injector, a malfunctioning mass airflow (MAF) sensor, or issues with the fuel pressure regulator.

4. Can a dirty air filter trigger the P1165 code in an Audi?

Yes, a clogged or dirty air filter can restrict airflow, causing the engine to run rich and potentially trigger the P1165 code.

5. How can a faulty oxygen sensor lead to the P1165 code?

A malfunctioning oxygen sensor may provide incorrect readings to the engine control unit (ECU), impacting fuel trim adjustments and causing a rich condition.

6. Is it safe to drive an Audi with the P1165 code?

While the car may still be drivable, prolonged operation with this code can lead to engine damage, increased emissions, and poor fuel economy. Repairs should be addressed promptly.

7. How do you diagnose the P1165 code on an Audi?

Diagnosis typically involves checking fuel trim data, inspecting the oxygen and MAF sensors, testing fuel injectors, and verifying fuel system pressure.

8. Can a vacuum leak cause the P1165 code in an Audi?

No, vacuum leaks usually cause a lean condition rather than a rich one. P1165 is more likely related to fuel delivery or sensor issues.

9. What repairs can fix the P1165 code on an Audi?

Repairs may include replacing the oxygen sensor, cleaning or replacing the MAF sensor, repairing or replacing faulty fuel injectors, or addressing fuel system issues.

10. How much does it cost to fix the P1165 code on an Audi?

Repair costs vary depending on the issue but can range from $100 to $500 for parts and labor, depending on whether sensors, injectors, or other components need replacement.