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P0171 Acura Code - Fuel System Too Lean

Quick Answer

The P0171 code for Acura vehicles indicates that the fuel system is running too lean. Common causes include Vacuum leak, Faulty fuel injector, Dirty or faulty mass airflow sensor. 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 Acura indicates Fuel System Too Lean.
Common causes
Common causes include Vacuum leak, Faulty fuel injector, Dirty or faulty mass airflow sensor.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code P0171 Acura Description

The P0171 code for Acura vehicles indicates that the fuel system is running too lean. This means that there is an imbalance in the air-fuel mixture entering the engine, with more air than fuel present. This can lead to a variety of issues, including poor fuel economy, rough idle, hesitation or stumbling during acceleration, and potentially even engine misfires. The engine may also run hotter than normal, leading to potential damage to components over time. The underlying cause of this code is typically a vacuum leak, faulty fuel injector, or issues with the mass airflow sensor.

OBDII Code P0171 Acura - Fuel System Too Lean
P0171 Acura Code - Fuel System Too Lean

Common Causes of P0171 Acura

  1. Vacuum leak
  2. Faulty fuel injector
  3. Dirty or faulty mass airflow sensor
  4. Faulty oxygen sensor
  5. Clogged fuel filter

Symptoms of P0171 Acura

  1. Poor fuel economy
  2. Rough idle
  3. Hesitation or stumbling during acceleration
  4. Engine misfires
  5. Overheating

How to Fix P0171 Acura

  1. Perform a visual inspection of vacuum hoses and connections to identify any leaks. Replace or repair any damaged components.
  2. Test and potentially replace the fuel injector if faulty.
  3. Clean or replace the mass airflow sensor.
  4. Test and potentially replace the oxygen sensor if needed.
  5. Replace the fuel filter if clogged.

Cost to Fix P0171 Acura

The cost of repairing a P0171 code on an Acura can vary depending on the specific cause of the issue. On average, the cost can range from $100 to $500 for parts and labor. Keep in mind that labor rates can vary based on location and shop rates. It's recommended to get a few quotes from reputable auto repair shops to get a more accurate estimate for your specific situation.

What does this mean?

Tech Notes for P0171 Acura

If the P0171 is combined with the P0174 code, it's highly 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 Mass Air Flow (MAF) Sensor. If the problem persists, the A/F Sensor (Sensor 1) may need to be replaced.

There is a Factory Service Bulletin for the following Acura models:
2007 Acura TL Type–S
2008 Acura TL Type–S
2007-2008 Acura TL Factory Service Bulletin OBDII Code P0171

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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 Acura Code

1. What are the common symptoms of OBDII code P0171 in an Acura?

Symptoms may include rough idling, lack of power, poor fuel economy, and the illumination of the Check Engine Light.

2. What are the typical causes of the OBDII code P0171 in an Acura?

Common causes of code P0171 include a vacuum leak, faulty Mass Air Flow (MAF) sensor, clogged fuel filter, or a malfunctioning oxygen sensor.

3. How can I diagnose the OBDII code P0171 in my Acura?

You can diagnose code P0171 by checking for vacuum leaks, inspecting the MAF sensor, testing the oxygen sensor, and ensuring the fuel system components are functioning properly.

4. What repairs might be needed to fix the OBDII code P0171 in an Acura?

Repairs may involve fixing vacuum leaks, cleaning or replacing the MAF sensor, replacing the fuel filter, or replacing a faulty oxygen sensor.

5. Can a dirty air filter trigger the OBDII code P0171 in an Acura?

Yes, a dirty air filter can cause an imbalance in the air-fuel mixture, leading to a lean condition and triggering code P0171.

6. Is it safe to continue driving my Acura with the OBDII code P0171?

It is not recommended to drive your Acura with code P0171 as it can lead to engine damage over time. It's best to address the issue promptly.

7. How can I prevent the OBDII code P0171 from recurring in my Acura?

To prevent code P0171 from coming back, regularly maintain your vehicle by changing the air filter, fuel filter, and ensuring the engine is in good condition.

8. Can a malfunctioning catalytic converter cause the OBDII code P0171 in an Acura?

Yes, a failing catalytic converter can lead to improper exhaust gas readings, triggering code P0171 in your Acura.

9. Will resetting the Check Engine Light clear the OBDII code P0171 in my Acura?

Clearing the Check Engine Light will not fix the underlying issue causing code P0171. It's important to diagnose and repair the root cause of the problem.

10. How can a professional mechanic help me resolve the OBDII code P0171 in my Acura?

A trained mechanic can perform a thorough diagnosis, pinpoint the exact cause of code P0171, and perform the necessary repairs to ensure your Acura runs smoothly.

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