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P0174 Acura Code - Fuel System Too Lean Bank 2

Quick Answer

The P0174 code for Acura vehicles indicates that the fuel system on Bank 2 is running too lean. Common causes include Faulty oxygen sensor, Vacuum leak, Clogged fuel filter. 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
P0174 Acura indicates Fuel System Too Lean Bank 2.
Common causes
Common causes include Faulty oxygen sensor, Vacuum leak, Clogged fuel filter.
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 Sep 08, 2024
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Code P0174 Acura Description

The P0174 code for Acura vehicles indicates that the fuel system on Bank 2 is running too lean. This means that there is an imbalance in the air-fuel mixture being delivered to the engine, with not enough fuel present. This can lead to poor engine performance, reduced fuel efficiency, and potential damage to the engine over time if not addressed. The fuel system being too lean can cause the engine to run hot, potentially leading to overheating and other serious issues if left unresolved.

OBDII Code P0174 Acura - Fuel System Too Lean Bank 2
P0174 Acura Code - Fuel System Too Lean Bank 2

Common Causes of P0174 Acura

  1. Faulty oxygen sensor
  2. Vacuum leak
  3. Clogged fuel filter
  4. Malfunctioning fuel injector
  5. Issue with the fuel pressure regulator

Symptoms of P0174 Acura

  1. Rough idling
  2. Hesitation during acceleration
  3. Decreased fuel efficiency
  4. Engine misfires
  5. Stalling

How to Fix P0174 Acura

  1. Perform a diagnostic scan to confirm the P0174 code and identify the specific cause of the lean condition.
  2. Inspect and replace the oxygen sensor if faulty.
  3. Check for vacuum leaks and repair as necessary.
  4. Replace the fuel filter to ensure proper fuel flow.
  5. Test and potentially replace the fuel injector or fuel pressure regulator if found to be faulty.

Cost to Fix P0174 Acura

The typical repair costs for addressing a P0174 code on an Acura can range from $200 to $800, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates can vary, so it's recommended to check with local auto repair shops for a more accurate estimate.

What does this mean?

Tech Notes for P0174 Acura

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.

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 P0174

When is the Code Detected?

- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)

Need more information about the P0174 Acura code?

Need more information on how to fix the P0174 Acura code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0174 Acura code diagnosed by a professional: Find a repair shop in your area

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 P0174 Acura Code

1. What are the common symptoms of OBDII code P0174 (Fuel System Too Lean Bank 2) in an Acura?

- Common symptoms include rough idling, loss of power, engine hesitation, stalling, and an illuminated check engine light.

2. What are the possible causes of OBDII code P0174 in an Acura?

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

3. How can I diagnose the OBDII code P0174 in my Acura?

- Diagnosing the code may involve checking for vacuum leaks, testing oxygen sensors, inspecting the fuel filter, cleaning or replacing the mass airflow sensor, and checking the fuel injectors for proper operation.

4. Can a dirty air filter cause OBDII code P0174 in an Acura?

- Yes, a dirty or clogged air filter can disrupt the air-fuel mixture ratio, leading to a lean condition and triggering code P0174.

5. Is it safe to continue driving my Acura with OBDII code P0174 present?

- It is not recommended to drive your vehicle with code P0174 active, as it can lead to poor engine performance, reduced fuel efficiency, and potential damage to engine components over time.

6. How much does it typically cost to repair OBDII code P0174 in an Acura?

- The cost of repairs for code P0174 can vary depending on the underlying cause. Costs may range from a simple fix like replacing a vacuum hose to more involved repairs like replacing oxygen sensors or the mass airflow sensor.

7. Can I reset the check engine light after fixing OBDII code P0174 in my Acura?

- Yes, once the underlying issue causing code P0174 has been resolved, the check engine light can be reset using an OBDII scanner or by disconnecting the car's battery for a few minutes.

8. What are some preventive maintenance tips to help avoid OBDII code P0174 in an Acura?

- Regularly changing the air filter, fuel filter, and performing scheduled maintenance on components like oxygen sensors and the mass airflow sensor can help prevent code P0174 from recurring.

9. Will code P0174 cause my Acura to fail an emissions test?

- Yes, OBDII code P0174 indicates a problem with the fuel system, which can lead to increased emissions. If not addressed, it can cause your Acura to fail an emissions test.

10. Can a DIY enthusiast repair OBDII code P0174 in an Acura?

- Depending on the cause, some DIY repairs for code P0174 may be possible, such as checking for vacuum leaks or replacing an air filter. However, more complex issues may require professional diagnosis and repair.

Discuss the causes and fixes for P0174 Acura OBDII Code

Submit a New Comment

  • I have a Acura 2004 mdx wit the code po174 how can I get it fix

    Reply to Comment

  • There are many things that could trigger the P0174 code, including bad or low octane gas. You could start by using high octane gas for a couple of weeks and if possible add a fuel additive to the gas tank.

    Reply to Comment

  • I have a 2008 Acura TL type S with the code P0174. What can I do to fix it? At first I kept having a drained battery but I think that is because I need to replace the hands free link system and then the check engine light came on and the p0174 code showed up and then the check engine light went off right after but I have noticed that I am running through fuel fast and when driving it feels like it's not driving as good as it use to. Also I have always put ethanol free gas in it. Any suggestions would be great.

    Reply to Comment

  • There is a factory service bulletin for that code. Please see "Tech Notes" above. The bulletin suggest to reprogram the Powertrain Control Module (PCM) to fix the problem.

    Reply to Comment