AutoCodes – Nissan – P0174 2005 Nissan Maxima

P0174 2005 Nissan Maxima Code - Fuel Injection System Too Lean Bank 2

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: P0174 2005 Nissan Maxima indicates Fuel Injection System Too Lean Bank 2.
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 4,842

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 Aug 21, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0174 2005 Nissan Maxima 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 MIL (2 trip detection logic).

OBDII Code P0174 2005 Nissan Maxima - Fuel Injection System Too Lean Bank 2 - AutoCodes.com — P0174 2005 Nissan Maxima Code - Fuel Injection System Too Lean Bank 2

What does this mean?

What are the Possible Causes of the DTC P0174 2005 Nissan Maxima?

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 P0174 2005 Nissan Maxima?

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 P0174 2005 Nissan Maxima 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 P0174 2005 Nissan Maxima Code

1. What are the common symptoms of OBDII code P0174 (Fuel Injection System Too Lean Bank 2) in a 2005 Nissan Maxima?

- Common symptoms include rough idle, engine hesitation, loss of power, and an illuminated check engine light.

2. What are the possible causes of OBDII code P0174 in a 2005 Nissan Maxima?

- Possible causes include a vacuum leak, faulty oxygen sensor, clogged fuel filter, dirty mass airflow sensor, or a malfunctioning fuel injector.

3. How can I diagnose the OBDII code P0174 in my 2005 Nissan Maxima?

- Diagnose P0174 by performing a visual inspection for leaks, checking the oxygen sensor readings, testing the mass airflow sensor, and inspecting the fuel injector operation.

4. Can a dirty air filter cause OBDII code P0174 in a 2005 Nissan Maxima?

- Yes, a dirty air filter can restrict airflow and cause the engine to run lean, triggering code P0174.

5. Is it safe to continue driving my 2005 Nissan Maxima with OBDII code P0174?

- It is not recommended to drive with code P0174 as it can lead to engine damage over time. Have the issue diagnosed and repaired promptly.

6. How can I repair OBDII code P0174 in my 2005 Nissan Maxima?

- Repair options include replacing the oxygen sensor, cleaning or replacing the mass airflow sensor, checking for vacuum leaks, and ensuring proper fuel delivery.

7. Will resetting the check engine light clear OBDII code P0174 in a 2005 Nissan Maxima?

- Resetting the check engine light may temporarily clear the code, but it will reappear if the underlying issue is not addressed.

8. Can a bad fuel pump cause OBDII code P0174 in a 2005 Nissan Maxima?

- A failing fuel pump can lead to insufficient fuel delivery, causing the engine to run lean and triggering code P0174.

9. How much does it typically cost to repair OBDII code P0174 in a 2005 Nissan Maxima?

- The cost of repairs for code P0174 can vary depending on the underlying issue, but it can range from $100 to $500 or more, including parts and labor.

10. How do I prevent OBDII code P0174 from recurring in my 2005 Nissan Maxima?

- To prevent code P0174 from coming back, regularly maintain your vehicle by replacing air filters, checking for vacuum leaks, and using high-quality fuel.