AutoCodes – Honda – P0171 1996 Honda Civic

P0171 1996 Honda Civic Code - Air/Fuel Mixture System 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 1996 Honda Civic indicates Air/Fuel Mixture System 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 8,499

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 1996 Honda Civic 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 1996 Honda Civic - Air/Fuel Mixture System Lean Bank 1 - AutoCodes.com — P0171 1996 Honda Civic Code - Air/Fuel Mixture System Lean Bank 1

What does this mean?

What are the Possible Causes of the DTC P0171 1996 Honda Civic?

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 1996 Honda Civic?

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 1996 Honda Civic 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 P0171 1996 Honda Civic code?

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Need Help with the 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 P0171 1996 Honda Civic Code

1. What does OBDII code P0171 on a 1996 Honda Civic mean?

- OBDII code P0171 indicates a lean condition in the air/fuel mixture on Bank 1 of the engine.

2. What are the common symptoms of OBDII code P0171 in a 1996 Honda Civic?

- Common symptoms include rough idle, loss of power, poor fuel economy, and hesitation during acceleration.

3. What are the possible causes of OBDII code P0171 on a 1996 Honda Civic?

- Causes can include a vacuum leak, faulty oxygen sensor, clogged fuel filter, malfunctioning mass airflow sensor, or a problem with the fuel injectors.

4. How can I diagnose the OBDII code P0171 on my 1996 Honda Civic?

- Diagnosing the code involves checking for vacuum leaks, inspecting the oxygen sensor, testing the mass airflow sensor, and ensuring proper fuel pressure.

5. What are some repair tips for addressing OBDII code P0171 on a 1996 Honda Civic?

- Repair tips include fixing any vacuum leaks, replacing the oxygen sensor if needed, cleaning or replacing the mass airflow sensor, and checking the fuel filter.

6. Can a dirty or clogged air filter cause OBDII code P0171 in a 1996 Honda Civic?

- Yes, a dirty or clogged air filter can disrupt the air/fuel mixture and contribute to a lean condition triggering OBDII code P0171.

7. Is it safe to continue driving a 1996 Honda Civic with OBDII code P0171 present?

- It is not recommended to drive the vehicle with OBDII code P0171 as it can lead to potential engine damage and reduced performance.

8. How can I reset the OBDII code P0171 on my 1996 Honda Civic after repairs?

- You can reset the code using an OBDII scanner or by disconnecting the car's battery for a few minutes to clear the error code.

9. Will OBDII code P0171 on a 1996 Honda Civic cause the Check Engine light to illuminate?

- Yes, OBDII code P0171 will trigger the Check Engine light to come on in the 1996 Honda Civic to alert you of the air/fuel mixture issue.

10. Should I seek professional help to diagnose and repair OBDII code P0171 on my 1996 Honda Civic?

- If you are unsure of how to diagnose or repair the issue causing OBDII code P0171, it is recommended to consult a professional mechanic for assistance.