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P0171 2006 Infiniti G35 Code - Fuel Injection System Too Lean Bank 1

Quick Answer

The P0171 code on a 2006 Infiniti G35 indicates that the fuel injection system on bank 1 is running too lean. Common causes include Clogged fuel filter, Faulty fuel injector, Vacuum leak. 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 2006 Infiniti G35 indicates Fuel Injection System Too Lean Bank 1.
Common causes
Common causes include Clogged fuel filter, Faulty fuel injector, Vacuum leak.
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 17, 2024
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Code P0171 2006 Infiniti G35 Description

The P0171 code on a 2006 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. This can lead to a variety of issues, including poor fuel efficiency, reduced engine performance, and potential damage to the engine over time.

OBDII Code P0171 2006 Infiniti G35 - Fuel Injection System Too Lean Bank 1
P0171 2006 Infiniti G35 Code - Fuel Injection System Too Lean Bank 1

Common Causes of P0171 2006 Infiniti G35

  1. Clogged fuel filter
  2. Faulty fuel injector
  3. Vacuum leak
  4. Malfunctioning oxygen sensor
  5. Intake manifold leak

Symptoms of P0171 2006 Infiniti G35

  1. Rough idle
  2. Hesitation during acceleration
  3. Decreased fuel efficiency
  4. Engine stalling
  5. Check engine light illuminated

How to Fix P0171 2006 Infiniti G35

  1. Diagnose the issue using a scan tool to confirm the P0171 code and identify the specific cause.
  2. Inspect the fuel system components, including the fuel filter, fuel injectors, and oxygen sensor, for any signs of damage or malfunction.
  3. Check for vacuum leaks by visually inspecting hoses and connections, as well as performing a smoke test if necessary.
  4. Repair or replace any faulty components identified during the diagnostic process.
  5. Clear the code and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P0171 2006 Infiniti G35

The cost of repairing a P0171 code on a 2006 Infiniti G35 can vary depending on the specific cause of the issue. In general, the cost of parts such as a fuel filter, fuel injector, or oxygen sensor can range from $50 to $200 each. Labor costs at auto repair shops typically range from $80 to $150 per hour. Therefore, the total repair cost could range from $150 to $800 or more, depending on the extent of the repairs needed. It is advisable to consult with a qualified mechanic to get a more accurate estimate based on the specific diagnosis and repair required for your vehicle.

What does this mean?

Tech Notes for P0171 2006 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.)

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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 2006 Infiniti G35 Code

1. What are the common symptoms of OBDII code P0171 in a 2006 Infiniti G35?

- Common symptoms include rough idling, poor acceleration, loss of power, and the illumination of the check engine light.

2. What does the OBDII code P0171 indicate for a 2006 Infiniti G35?

- The code indicates that the fuel injection system on Bank 1 is running too lean, meaning there is an imbalance of air and fuel mixture.

3. What are the possible causes of OBDII code P0171 in a 2006 Infiniti G35?

- Common causes include a vacuum leak, faulty oxygen sensor, dirty or clogged fuel injectors, a malfunctioning mass airflow sensor, or a faulty fuel pressure regulator.

4. How can I diagnose the cause of OBDII code P0171 in my 2006 Infiniti G35?

- Diagnose by checking for vacuum leaks, inspecting the oxygen sensor, cleaning or replacing fuel injectors, testing the mass airflow sensor, and checking fuel pressure.

5. Can a dirty air filter cause OBDII code P0171 in a 2006 Infiniti G35?

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

6. Is it safe to continue driving my 2006 Infiniti G35 with OBDII code P0171?

- While it may be possible to drive with the code present, it is not recommended as it can lead to poor engine performance and potential damage over time.

7. How can I reset the OBDII code P0171 in my 2006 Infiniti G35?

- You can reset the code using an OBDII scanner or by disconnecting the car's battery for a few minutes, though the underlying issue should still be addressed.

8. Can a bad fuel pump cause OBDII code P0171 in a 2006 Infiniti G35?

- Yes, a failing fuel pump can affect fuel delivery, leading to a lean condition and triggering the P0171 code.

9. Will cleaning the mass airflow sensor help resolve OBDII code P0171 in a 2006 Infiniti G35?

- Cleaning the mass airflow sensor may help if it is dirty or contaminated, potentially improving the air-fuel mixture balance and resolving the lean condition.

10. How much does it typically cost to repair OBDII code P0171 in a 2006 Infiniti G35?

- The cost of repair can vary depending on the specific cause, but it may range from $100 to $500 or more, depending on the parts and labor required.

Discuss the causes and fixes for P0171 2006 Infiniti G35 OBDII Code

Submit a New Comment

  • It's has a misfire when rpm does down to 6000 rpm

    Reply to Comment

    • Thanks for the info. If your 2006 Infiniti G35 is throwing a P0171 (too lean, Bank 1) and you’re getting a misfire when RPM drops to around 600, that usually points to a vacuum or fuel delivery issue showing up at idle.

      Here’s what I’d check:

      • Vacuum leaks: Common on this engine—cracked vacuum hoses, intake boot, or PCV valve/hose can cause a lean mix and misfire at low RPMs.
      • Dirty or sticking MAF sensor: If it’s not reading airflow correctly, it can throw off the air/fuel mix. Try cleaning it with proper MAF cleaner.
      • Fuel pressure: A weak fuel pump or clogged filter can lean out the mixture, especially at idle when the system runs at low load.
      • Bank 1 O2 sensor: If the sensor is slow or failing, it might mislead the ECU into trimming fuel the wrong way.

      The misfire could be secondary, caused by the lean condition. Start with a smoke test for vacuum leaks and check fuel trim readings if you can. Fixing the lean issue usually clears up the misfire too.

      Let me know if anything was recently replaced or cleaned—it could help narrow things down.

      Reply to Comment