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Engine-Codes – Infiniti – P0171 2004 Infiniti G35

P0171 2004 Infiniti G35 Code - Fuel Injection System Too Lean Bank 1

Quick Answer

The P0171 code for a 2004 Infiniti G35 indicates that the fuel injection system on bank 1 is running too lean. Common causes include Vacuum leak, Faulty oxygen sensor, Clogged fuel filter. 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 2004 Infiniti G35 indicates Fuel Injection System Too Lean Bank 1.
Common causes
Common causes include Vacuum leak, Faulty oxygen sensor, Clogged fuel filter.
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 15, 2024
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Code P0171 2004 Infiniti G35 Description

The P0171 code for a 2004 Infiniti G35 indicates that the fuel injection system on bank 1 is running too lean. This means that there is an imbalance in the air-fuel mixture being delivered to the engine, with more air than fuel present. In a properly functioning system, the air-fuel ratio is carefully controlled to ensure efficient combustion and optimal engine performance. When the system is too lean, it can lead to a variety of issues that affect the vehicle's performance and overall operation.

OBDII Code P0171 2004 Infiniti G35 - Fuel Injection System Too Lean Bank 1
P0171 2004 Infiniti G35 Code - Fuel Injection System Too Lean Bank 1

Common Causes of P0171 2004 Infiniti G35

  1. Vacuum leak
  2. Faulty oxygen sensor
  3. Clogged fuel filter
  4. Malfunctioning mass airflow sensor
  5. Issues with fuel injectors

Symptoms of P0171 2004 Infiniti G35

  1. Lack of power during acceleration
  2. Rough idling or stalling
  3. Engine misfires
  4. Hesitation or stumbling during acceleration
  5. Reduced fuel efficiency

How to Fix P0171 2004 Infiniti G35

  1. Perform a thorough inspection of the vacuum system to check for leaks and repair as necessary.
  2. Test and replace the oxygen sensor if it is faulty.
  3. Replace the fuel filter to ensure proper fuel flow.
  4. Clean or replace the mass airflow sensor to restore accurate readings.
  5. Inspect and clean or replace the fuel injectors if they are not functioning properly.

Cost to Fix P0171 2004 Infiniti G35

The cost estimate for repairing a P0171 code on a 2004 Infiniti G35 can vary depending on the specific cause of the issue and the parts and labor required for the repair. In general, the cost of parts for this type of repair can range from $100 to $500, with labor costs adding an additional $100 to $300. Overall, the total repair cost can range from $200 to $800. It is important to note that these are rough estimates, and actual costs may vary based on the specific circumstances of the repair and the rates charged by auto repair shops in your area. It is recommended to obtain quotes from multiple shops to ensure the best price for the repair.

What does this mean?

Tech Notes for P0171 2004 Infiniti G35

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.

When is the Code Detected?

- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)

Need more information about the P0171 2004 Infiniti G35 code?

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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 2004 Infiniti G35 Code

1. What does OBDII code P0171 on a 2004 Infiniti G35 mean?

The OBDII code P0171 in a 2004 Infiniti G35 indicates a fuel injection system too lean condition on Bank 1.

2. What are the common symptoms of OBDII code P0171 on a 2004 Infiniti G35?

Common symptoms of code P0171 in a 2004 Infiniti G35 include rough idling, poor acceleration, engine hesitation, and possibly an illuminated check engine light.

3. What are the possible causes of OBDII code P0171 on a 2004 Infiniti G35?

Common causes of code P0171 in a 2004 Infiniti G35 include a vacuum leak, faulty oxygen sensor, dirty or clogged fuel injectors, fuel pressure issues, or a malfunctioning mass airflow sensor.

4. How can I diagnose the issue causing OBDII code P0171 on my 2004 Infiniti G35?

To diagnose the cause of code P0171, you can start by checking for vacuum leaks, inspecting the oxygen sensor, cleaning or replacing fuel injectors, testing fuel pressure, and examining the mass airflow sensor for any problems.

5. Can a dirty air filter trigger OBDII code P0171 on a 2004 Infiniti G35?

Yes, a dirty air filter can restrict airflow to the engine, causing a lean fuel condition that triggers code P0171 in a 2004 Infiniti G35.

6. How important is it to address OBDII code P0171 on a 2004 Infiniti G35 promptly?

It is important to address code P0171 promptly on a 2004 Infiniti G35 to prevent potential engine damage, poor performance, and reduced fuel efficiency.

7. Is it safe to continue driving my 2004 Infiniti G35 with OBDII code P0171 present?

It is not recommended to drive your 2004 Infiniti G35 with code P0171 present, as it can lead to engine misfires, increased emissions, and other potential issues.

8. Can a faulty fuel pump cause OBDII code P0171 on a 2004 Infiniti G35?

Yes, a faulty fuel pump that does not deliver enough fuel pressure can contribute to a lean fuel condition triggering code P0171 in a 2004 Infiniti G35.

9. How much does it typically cost to repair OBDII code P0171 on a 2004 Infiniti G35?

The cost to repair code P0171 on a 2004 Infiniti G35 can vary depending on the specific cause, but it may range from around $100 for simple fixes like replacing an air filter to several hundred dollars for more complex repairs like replacing a faulty oxygen sensor.

10. Can a DIY enthusiast fix OBDII code P0171 on a 2004 Infiniti G35, or is it best left to a professional mechanic?

While some aspects of diagnosing and repairing code P0171 on a 2004 Infiniti G35 may be tackled by a DIY enthusiast, more complex issues like fuel system diagnostics or sensor replacements are best left to a professional mechanic with the necessary tools and expertise.

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