AutoCodes – Nissan – P0171 2008 Nissan Maxima

P0171 2008 Nissan Maxima Code - Fuel Injection System Too Lean Bank 1

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: P0171 2008 Nissan Maxima indicates Fuel Injection System Too Lean Bank 1.
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 7,640

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 Jul 20, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0171 2008 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 P0171 2008 Nissan Maxima - Fuel Injection System Too Lean Bank 1 - AutoCodes.com — P0171 2008 Nissan Maxima Code - Fuel Injection System Too Lean Bank 1

What does this mean?

What are the Possible Causes of the DTC P0171 2008 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 P0171 2008 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 P0171 2008 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 P0171 2008 Nissan Maxima Code

1. What does the OBDII code P0171 on a 2008 Nissan Maxima mean?

The code P0171 indicates that the fuel injection system on Bank 1 is running too lean, meaning there is an imbalance of air and fuel mixture.

2. What are the common symptoms of the P0171 code on a 2008 Nissan Maxima?

Common symptoms of the P0171 code include rough idling, poor acceleration, engine misfires, and a decrease in fuel efficiency.

3. What are the possible causes of the P0171 code on a 2008 Nissan Maxima?

Common causes of the P0171 code include a vacuum leak, faulty oxygen sensor, clogged fuel filter, dirty MAF sensor, or a malfunctioning fuel injector.

4. How can I diagnose the P0171 code on my 2008 Nissan Maxima?

Diagnosing the P0171 code typically involves checking for vacuum leaks, inspecting the oxygen sensor, cleaning or replacing the MAF sensor, testing the fuel pressure, and examining the fuel injectors.

5. Can a dirty air filter trigger the P0171 code on a 2008 Nissan Maxima?

Yes, a dirty air filter can disrupt the air-fuel mixture ratio and lead to the P0171 code. Regularly replacing the air filter is a simple maintenance task that can prevent this issue.

6. How can I repair the P0171 code on my 2008 Nissan Maxima?

To repair the P0171 code, you may need to fix any vacuum leaks, replace the oxygen sensor, clean or replace the MAF sensor, change the fuel filter, or service/replace faulty fuel injectors.

7. Is it safe to continue driving my 2008 Nissan Maxima with the P0171 code?

It is not recommended to drive your vehicle for an extended period with the P0171 code present, as it can lead to engine damage and decreased performance. It's best to address the issue promptly.

8. Can a bad fuel pump cause the P0171 code on a 2008 Nissan Maxima?

A failing fuel pump can contribute to the P0171 code by not delivering enough fuel to maintain the proper air-fuel mixture ratio. It's advisable to inspect the fuel pump as part of the diagnostic process.

9. Will resetting the OBDII system clear the P0171 code on my 2008 Nissan Maxima?

Resetting the OBDII system may temporarily clear the P0171 code, but if the underlying issue is not addressed, the code is likely to reappear. It's crucial to diagnose and fix the root cause of the problem.

10. How can I prevent the P0171 code from reoccurring on my 2008 Nissan Maxima?

Regular maintenance, such as replacing the air filter, cleaning the MAF sensor, checking for vacuum leaks, and using quality fuel, can help prevent the P0171 code from reoccurring.