AutoCodes – Infiniti – P0171 2005 Infiniti G35

P0171 2005 Infiniti G35 Code - Fuel Injection System Too Lean Bank 1

Quick Answer

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. Common causes include Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring. 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: P0171 2005 Infiniti G35 indicates Fuel Injection System Too Lean Bank 1.
Common causes: Common causes include Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring.
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 6,800

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 20, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0171 2005 Infiniti G35 Description

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic).

OBDII Code P0171 2005 Infiniti G35 - Fuel Injection System Too Lean Bank 1 - AutoCodes.com — P0171 2005 Infiniti G35 Code - Fuel Injection System Too Lean Bank 1

What does this mean?

What are the Possible Causes of the DTC P0171 2005 Infiniti G35?

Intake air leaks
Faulty front heated oxygen sensor
Ignition misfiring
Faulty fuel injectors
Exhaust gas leaks
Incorrect fuel pressure
Lack of fuel
Faulty Mass Air Flow (MAF) sensor
Incorrect Positive Crankcase Ventilation (PCV) hose connection

How to Fix the DTC P0171 2005 Infiniti G35?

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 does this mean?

Code Tech Notes

If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0171 2005 Infiniti G35 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.

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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 P0171 2005 Infiniti G35 Code

1. What does OBDII code P0171 mean for a 2005 Infiniti G35?

Code P0171 indicates that the fuel injection system on Bank 1 is running too lean, meaning there is an imbalance in the air-fuel mixture.

2. What are the common symptoms of OBDII code P0171 on a 2005 Infiniti G35?

Common symptoms include rough idling, poor acceleration, engine hesitation, and possibly a decrease in fuel efficiency.

3. What are the potential causes of OBDII code P0171 on a 2005 Infiniti G35?

Possible causes include a vacuum leak, faulty oxygen sensor, clogged fuel injectors, intake air leaks, or a malfunctioning mass airflow sensor.

4. How can I diagnose the OBDII code P0171 on my 2005 Infiniti G35?

Diagnosis typically involves checking for vacuum leaks, inspecting the oxygen sensor, testing the fuel injectors, examining the intake system for leaks, and verifying the mass airflow sensor's operation.

5. Can a dirty air filter trigger OBDII code P0171 on a 2005 Infiniti G35?

Yes, a dirty air filter can disrupt the air-fuel mixture ratio and lead to a lean condition, potentially triggering code P0171.

6. Is it safe to continue driving with OBDII code P0171 on a 2005 Infiniti G35?

Continuing to drive with code P0171 may cause damage to the engine over time and result in decreased performance. It is recommended to address the issue promptly.

7. How can I reset OBDII code P0171 on my 2005 Infiniti G35?

Resetting the code can be done using an OBDII scanner tool after addressing the underlying issue that triggered the code.

8. Will OBDII code P0171 on a 2005 Infiniti G35 affect emissions testing?

Yes, code P0171 can cause the vehicle to fail emissions testing due to its impact on the fuel system and emissions output.

9. Are there any DIY repair tips for fixing OBDII code P0171 on a 2005 Infiniti G35?

DIY repair tips include checking for visible leaks, cleaning or replacing the air filter, inspecting the oxygen sensor, and ensuring proper fuel injector function.

10. Should I seek professional help for OBDII code P0171 on my 2005 Infiniti G35?

If you are unsure about diagnosing or repairing the issue causing code P0171, it is recommended to seek help from a qualified mechanic to properly address the problem.