AutoCodes – Honda – P0171 2010 Honda Accord

P0171 2010 Honda Accord 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 closer 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 2010 Honda Accord 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 10,005

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 Sep 29, 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 2010 Honda Accord Description

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closer 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 Malfunction Indicator Light (MIL) (2 trip detection logic). The Diagnostic Trouble Code (DTC) will be set when the fuel injection system does not operate properly, or the amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)

OBDII Code P0171 2010 Honda Accord - Fuel Injection System Too Lean Bank 1 - AutoCodes.com — P0171 2010 Honda Accord Code - Fuel Injection System Too Lean Bank 1

What does this mean?

What are the Possible Causes of the DTC P0171 2010 Honda Accord?

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 2010 Honda Accord?

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 other codes, 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 2010 Honda Accord 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 2010 Honda Accord Code

1. What does the OBDII code P0171 mean for a 2010 Honda Accord?

The code P0171 indicates that the fuel injection system on Bank 1 is running too lean, meaning there is too much air and not enough fuel in the mixture.

2. What are the common symptoms of a P0171 code on a 2010 Honda Accord?

Common symptoms include rough idling, poor acceleration, hesitation, engine stalling, and an illuminated Check Engine Light.

3. What are the possible causes of a P0171 code on a 2010 Honda Accord?

Potential causes include a vacuum leak, faulty oxygen sensor, clogged fuel filter, fuel pump issues, a dirty mass airflow sensor, or a malfunctioning fuel injector.

4. How can I diagnose the cause of a P0171 code on my 2010 Honda Accord?

Diagnosing the issue may involve checking for vacuum leaks, testing the oxygen sensor, inspecting the fuel filter, testing the fuel pump pressure, cleaning the mass airflow sensor, and checking the fuel injector.

5. Can a dirty air filter trigger a P0171 code on a 2010 Honda Accord?

Yes, a dirty air filter can disrupt the air-to-fuel ratio and contribute to a lean condition, potentially triggering the P0171 code.

6. How serious is a P0171 code on a 2010 Honda Accord?

While the vehicle may still be operational with a P0171 code, it is important to address it promptly to prevent potential damage to the engine and ensure optimal performance and fuel efficiency.

7. Can I drive my 2010 Honda Accord with a P0171 code?

It is generally not recommended to drive your vehicle for an extended period with a P0171 code, as it can lead to decreased performance and potential engine damage over time.

8. How can I repair a P0171 code on my 2010 Honda Accord?

Repair options may include fixing any vacuum leaks, replacing the oxygen sensor, cleaning or replacing the fuel filter, addressing fuel pump issues, cleaning the mass airflow sensor, or replacing a faulty fuel injector.

9. Will resetting the Check Engine Light fix the P0171 code on my 2010 Honda Accord?

Resetting the Check Engine Light may temporarily clear the code, but it will not fix the underlying issue causing the P0171 code. It's essential to diagnose and repair the problem to prevent it from recurring.

10. How much does it typically cost to repair a P0171 code on a 2010 Honda Accord?

The cost of repairing a P0171 code can vary depending on the underlying cause. Simple fixes like replacing a dirty air filter may be relatively inexpensive, while more complex issues like a faulty oxygen sensor or fuel pump can be more costly.