AutoCodes – Honda – P0171 1998 Honda Civic

P0171 1998 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 1998 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 10,860

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 1998 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 1998 Honda Civic - Air/Fuel Mixture System Lean Bank 1 - AutoCodes.com — P0171 1998 Honda Civic Code - Air/Fuel Mixture System Lean Bank 1

What does this mean?

What are the Possible Causes of the DTC P0171 1998 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 1998 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 1998 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 1998 Honda Civic 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 1998 Honda Civic Code

1. What does OBDII code P0171 on a 1998 Honda Civic mean?

- It indicates a lean condition in the air/fuel mixture on bank 1 of the engine.

2. What are common symptoms of a P0171 code on a 1998 Honda Civic?

- Symptoms may include rough idling, loss of power, hesitation, and increased fuel consumption.

3. What are possible causes of a P0171 code on a 1998 Honda Civic?

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

4. How can I diagnose the source of a P0171 code on my 1998 Honda Civic?

- You can use a scan tool to monitor live data and look for issues such as high long-term fuel trims, inspect for vacuum leaks, check the oxygen sensor operation, and test the mass airflow sensor.

5. Can a dirty air filter trigger a P0171 code on a 1998 Honda Civic?

- Yes, a dirty air filter can disrupt the air/fuel mixture balance and contribute to a lean condition that triggers the P0171 code.

6. Is it safe to continue driving with a P0171 code on a 1998 Honda Civic?

- It's not recommended to drive for an extended period with a lean condition as it can lead to engine damage. Prompt diagnosis and repair are advised.

7. How can I fix a P0171 code on my 1998 Honda Civic?

- Repair methods may include fixing vacuum leaks, replacing the oxygen sensor, cleaning or replacing fuel injectors, and cleaning the mass airflow sensor.

8. Will resetting the OBDII system clear a P0171 code on a 1998 Honda Civic?

- Resetting the system may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to return after driving.

9. Can bad spark plugs cause a P0171 code on a 1998 Honda Civic?

- While bad spark plugs may not directly cause a P0171 code, they can lead to inefficient combustion, which may contribute to a lean condition triggering the code.

10. How do I prevent a P0171 code from appearing on my 1998 Honda Civic?

- Regular maintenance, such as changing air filters, spark plugs, and ensuring proper fuel system operation, can help prevent issues that lead to a P0171 code.