AutoCodes – Volvo – P1171 Volvo

P1171 Volvo Code - Long Term Fuel Trim

Quick Answer

The control module receives information from the heated oxygen sensor about fuel/air mixture when idling at both lower and upper part-load range. Common causes include Intake air leakage, Exhaust system air leakage, Low 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: P1171 Volvo indicates Long Term Fuel Trim.
Common causes: Common causes include Intake air leakage, Exhaust system air leakage, Low 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 3,294

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 P1171 Volvo Description

The control module receives information from the heated oxygen sensor about fuel/air mixture when idling at both lower and upper part-load range. If the fuel/air mixture deviates from the computed ideal value, short-term fuel trim will compensate for this by adjusting the injection time so that the ideal value is achieved.

OBDII Code P1171 Volvo - Long Term Fuel Trim - AutoCodes.com — P1171 Volvo Code - Long Term Fuel Trim

What does this mean?

What are the Possible Causes of the DTC P1171 Volvo?

Intake air leakage
Exhaust system air leakage
Low fuel pressure
Faulty heated oxygen sensor

How to Fix the DTC P1171 Volvo?

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 P1171 Volvo 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 P1171 Volvo code?

Need more information on how to fix the P1171 Volvo code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1171 Volvo 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 P1171 Volvo Code

1. What is OBDII code P1171 in Volvo vehicles related to Long Term Fuel Trim?

- OBDII code P1171 in Volvo vehicles is related to Long Term Fuel Trim being outside the specified range, indicating a potential issue with fuel mixture adjustments.

2. What are common symptoms of OBDII code P1171 in a Volvo?

- Common symptoms of OBDII code P1171 in a Volvo may include rough idling, poor fuel economy, lack of power, and potentially the illumination of the check engine light.

3. What are possible causes of OBDII code P1171 in a Volvo?

- Possible causes of OBDII code P1171 in a Volvo include a vacuum leak, faulty oxygen sensor, fuel pressure regulator issues, intake air leaks, or a problem with the mass airflow sensor.

4. How can I diagnose the OBDII code P1171 in my Volvo?

- Diagnosing OBDII code P1171 in your Volvo may involve using an OBDII scanner to retrieve the code, checking for any visible signs of damage or leaks in the intake system, inspecting the oxygen sensor, and performing a fuel pressure test.

5. Can I drive my Volvo with OBDII code P1171?

- It is generally not recommended to drive your Volvo with OBDII code P1171, as it can lead to poor performance and potentially cause damage to the engine over time. It is best to address the issue promptly.

6. How can I repair OBDII code P1171 in my Volvo?

- Repairing OBDII code P1171 in your Volvo may involve fixing any vacuum leaks, replacing a faulty oxygen sensor, checking and adjusting the fuel pressure regulator, repairing intake air leaks, or cleaning or replacing the mass airflow sensor.

7. Is it necessary to reset the OBDII code P1171 after repairs?

- Yes, it is recommended to reset the OBDII code P1171 after making repairs to clear the code from the system and ensure that the issue has been properly addressed. This can be done using an OBDII scanner.

8. How can I prevent OBDII code P1171 from appearing in my Volvo?

- To prevent OBDII code P1171 from appearing in your Volvo, it is important to perform regular maintenance, such as checking for vacuum leaks, replacing the oxygen sensor as needed, ensuring proper fuel system operation, and keeping the intake system clean.

9. Can a DIY enthusiast fix OBDII code P1171 in a Volvo?

- Depending on the level of expertise and access to tools, a DIY enthusiast may be able to fix OBDII code P1171 in a Volvo by following repair guides, performing necessary inspections, and replacing any faulty components.

10. Is it necessary to visit a mechanic for OBDII code P1171 diagnosis and repair?

- While some DIY enthusiasts may be able to diagnose and repair OBDII code P1171 in a Volvo, it is recommended to visit a mechanic if you are unsure about the diagnosis or lack the tools and expertise to address the issue effectively.