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Engine-Codes – Nissan – P0174 2009 Nissan Pathfinder

P0174 2009 Nissan Pathfinder Code - Fuel Injection System Too Lean Bank 2

Quick Answer

The P0174 code on a 2009 Nissan Pathfinder indicates that the fuel injection system on bank 2 is running too lean. Common causes include Vacuum leak, Faulty oxygen sensor, Clogged fuel injector. 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
P0174 2009 Nissan Pathfinder indicates Fuel Injection System Too Lean Bank 2.
Common causes
Common causes include Vacuum leak, Faulty oxygen sensor, Clogged fuel injector.
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 13, 2024
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Code P0174 2009 Nissan Pathfinder Description

The P0174 code on a 2009 Nissan Pathfinder indicates that the fuel injection system on bank 2 is running too lean. This means that there is an imbalance in the air-fuel mixture being delivered to the engine on the second bank of cylinders. In a properly functioning system, the air-fuel mixture should be balanced to ensure optimal combustion and performance. When the mixture is too lean, there is not enough fuel being delivered to the cylinders, which can lead to a variety of issues.

OBDII Code P0174 2009 Nissan Pathfinder - Fuel Injection System Too Lean Bank 2
P0174 2009 Nissan Pathfinder Code - Fuel Injection System Too Lean Bank 2

Common Causes of P0174 2009 Nissan Pathfinder

  1. Vacuum leak
  2. Faulty oxygen sensor
  3. Clogged fuel injector
  4. Dirty mass airflow sensor
  5. Malfunctioning fuel pressure regulator

Symptoms of P0174 2009 Nissan Pathfinder

  1. Rough idling
  2. Engine misfires
  3. Hesitation during acceleration
  4. Decreased fuel efficiency
  5. Check Engine Light illuminated

How to Fix P0174 2009 Nissan Pathfinder

  1. Perform a thorough inspection of the fuel injection system, including checking for vacuum leaks and testing the oxygen sensor.
  2. Clean or replace clogged fuel injectors and mass airflow sensor.
  3. Test and potentially replace the fuel pressure regulator if faulty.
  4. Clear the diagnostic trouble codes and reset the Check Engine Light.
  5. Test drive the vehicle to ensure the issue has been resolved and the air-fuel mixture is now balanced.

Cost to Fix P0174 2009 Nissan Pathfinder

The cost of repairing a P0174 code on a 2009 Nissan Pathfinder can vary depending on the specific cause of the lean condition. On average, the repair costs for this issue can range from $200 to $800, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple sources to ensure a fair price. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

What does this mean?

Tech Notes for P0174 2009 Nissan Pathfinder

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 P0174 2009 Nissan Pathfinder Code

1. What are the common symptoms of OBDII code P0174 in a 2009 Nissan Pathfinder?

- Common symptoms include rough idling, decreased fuel efficiency, lack of power, and possible engine misfires.

2. What does the OBDII code P0174 "Fuel Injection System Too Lean Bank 2" mean for a 2009 Nissan Pathfinder?

- This code indicates that the fuel system is delivering too little fuel to the engine on bank 2, which can lead to a lean air-fuel mixture.

3. What are the possible causes of OBDII code P0174 in a 2009 Nissan Pathfinder?

- Common causes include a vacuum leak, faulty oxygen sensors, clogged fuel injectors, a malfunctioning mass airflow sensor, or a failing fuel pump.

4. How can I diagnose the OBDII code P0174 in my 2009 Nissan Pathfinder?

- Diagnosing this code typically involves checking for vacuum leaks, inspecting the oxygen sensors, testing the fuel injectors, examining the mass airflow sensor, and assessing the fuel pump's performance.

5. Can driving with OBDII code P0174 in a 2009 Nissan Pathfinder cause further damage?

- Continuing to drive with this code can potentially lead to damage to the catalytic converter, oxygen sensors, and other engine components due to the lean air-fuel mixture.

6. What are some DIY repair tips for OBDII code P0174 in a 2009 Nissan Pathfinder?

- DIY repair tips include checking and replacing vacuum hoses, cleaning or replacing oxygen sensors, cleaning fuel injectors, inspecting the mass airflow sensor, and ensuring proper fuel pressure from the fuel pump.

7. How much does it typically cost to repair OBDII code P0174 in a 2009 Nissan Pathfinder?

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

8. Is it safe to continue driving my 2009 Nissan Pathfinder with OBDII code P0174?

- While the vehicle may still be operable with this code, it is recommended to address the issue promptly to prevent potential engine damage and ensure optimal performance.

9. How long does it take to repair OBDII code P0174 in a 2009 Nissan Pathfinder?

- The repair time can vary based on the specific cause of the code and the complexity of the repair, but it may take anywhere from a couple of hours to a full day at a repair shop.

10. Will resetting the OBDII code P0174 in a 2009 Nissan Pathfinder make it go away permanently?

- Resetting the code may temporarily turn off the Check Engine light, but if the underlying issue causing the lean condition is not addressed, the code is likely to reappear.

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