AutoCodes – Nissan – P0174 2011 Nissan Sentra

P0174 2011 Nissan Sentra 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 2011 Nissan Sentra 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 2,676

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 2011 Nissan Sentra 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 2011 Nissan Sentra - Fuel Injection System Too Lean Bank 2 - AutoCodes.com — P0174 2011 Nissan Sentra Code - Fuel Injection System Too Lean Bank 2

What does this mean?

What are the Possible Causes of the DTC P0174 2011 Nissan Sentra?

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 2011 Nissan Sentra?

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 2011 Nissan Sentra 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.

Need more information about the P0174 2011 Nissan Sentra 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 P0174 2011 Nissan Sentra Code

1. What are the common symptoms of OBDII code P0174 on a 2011 Nissan Sentra?

- Common symptoms include rough idling, poor acceleration, hesitation when accelerating, and a noticeable decrease in fuel efficiency.

2. What does the OBDII code P0174 mean on a 2011 Nissan Sentra?

- The code indicates that the fuel injection system on bank 2 of the engine is operating too lean, meaning there is an imbalance in the air-fuel mixture.

3. What are the possible causes of OBDII code P0174 on a 2011 Nissan Sentra?

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

4. How can I diagnose the cause of OBDII code P0174 on my 2011 Nissan Sentra?

- You can use a scan tool to check for any other related trouble codes, inspect the air intake system for leaks, test the oxygen sensor, and check the fuel pressure to diagnose the issue.

5. Can a dirty air filter cause OBDII code P0174 on a 2011 Nissan Sentra?

- Yes, a dirty air filter can restrict airflow and lead to a lean air-fuel mixture, triggering the P0174 trouble code.

6. How can I repair OBDII code P0174 on a 2011 Nissan Sentra?

- Repair options may include fixing any vacuum leaks, replacing the oxygen sensor, cleaning or replacing the fuel filter, cleaning the fuel injectors, or replacing a faulty mass airflow sensor.

7. Is it safe to continue driving with OBDII code P0174 on a 2011 Nissan Sentra?

- It is not recommended to continue driving with this code as it can lead to engine damage over time and may cause further issues with the vehicle's performance.

8. How much does it typically cost to repair OBDII code P0174 on a 2011 Nissan Sentra?

- The cost of repairs can vary depending on the specific cause of the issue, but it is advisable to budget for diagnostic fees, parts, and labor costs.

9. Can I reset the OBDII code P0174 on my 2011 Nissan Sentra with a simple reset tool?

- While you can reset the code with an OBDII scanner, it is crucial to address the underlying issue causing the lean condition to prevent the code from reoccurring.

10. Will fixing OBDII code P0174 improve the overall performance of my 2011 Nissan Sentra?

- Yes, resolving the lean fuel condition indicated by the code can help restore proper engine performance, improve fuel efficiency, and prevent potential damage to the engine components.