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P1491 Subaru Code - PCV Function Problem

Quick Answer

The P1491 diagnostic trouble code (DTC) for Subaru vehicles indicates a problem with the Positive Crankcase Ventilation (PCV) system. Common causes include Clogged or dirty PCV valve, Damaged PCV hose, Faulty PCV grommet. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P1491 Subaru indicates PCV Function Problem.
Common causes
Common causes include Clogged or dirty PCV valve, Damaged PCV hose, Faulty PCV grommet.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P1491 Subaru Description

The P1491 diagnostic trouble code (DTC) for Subaru vehicles indicates a problem with the Positive Crankcase Ventilation (PCV) system. The PCV system plays a crucial role in regulating the pressure and emissions within the engine. When the PCV system malfunctions, it can lead to various issues that affect the vehicle's performance and emissions output.

OBDII Code P1491 Subaru - PCV Function Problem
P1491 Subaru Code - PCV Function Problem

Common Causes of P1491 Subaru

  1. Clogged or dirty PCV valve
  2. Damaged PCV hose
  3. Faulty PCV grommet
  4. Vacuum leaks in the PCV system
  5. Engine oil contamination

Symptoms of P1491 Subaru

  1. Increased oil consumption
  2. Rough idling or stalling
  3. Decreased fuel efficiency
  4. Check engine light illuminated
  5. Visible smoke coming from the exhaust

How to Fix P1491 Subaru

  1. Perform a visual inspection of the PCV system components, including the valve, hose, and grommet, to check for any signs of damage or blockages.
  2. Test the PCV valve to ensure it is functioning correctly or replace it if necessary.
  3. Inspect and replace any damaged PCV hoses or grommets.
  4. Check for vacuum leaks in the PCV system and repair or replace any affected components.
  5. Clear the diagnostic trouble code and reset the vehicle's computer system to see if the issue has been resolved.

Cost to Fix P1491 Subaru

The cost of repairing a P1491 PCV Function Problem code on a Subaru can vary depending on the specific issue causing the fault and the labor rates in your area. On average, you can expect to pay between $100 and $300 for parts and labor. Keep in mind that prices may vary based on the severity of the problem and the model year of your Subaru. It is recommended to consult with a trusted mechanic or dealership for a more accurate cost estimate.

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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 P1491 Subaru Code

1. What does the OBDII code P1491 mean on a Subaru?

P1491 indicates a "PCV Function Problem," meaning there may be an issue with the Positive Crankcase Ventilation (PCV) system in the engine.

2. What are the symptoms of a P1491 code on a Subaru?

Common symptoms include poor engine performance, reduced fuel efficiency, rough idling, increased emissions, or the Check Engine Light illuminating.

3. What causes the P1491 code on a Subaru?

Causes can include a clogged or stuck PCV valve, a vacuum leak in the PCV system, damaged hoses, or buildup of sludge in the engine.

4. Can I drive my Subaru with a P1491 code?

It’s not recommended to drive for an extended period with a P1491 code, as unresolved PCV system issues can lead to engine damage or increased emissions.

5. How do I fix the P1491 code on my Subaru?

Start by inspecting and replacing the PCV valve if necessary. Check for cracked or damaged PCV hoses and clean any sludge buildup in the system.

6. How can I test the PCV valve on my Subaru?

Remove the PCV valve and shake it. If you don’t hear a rattling noise or if it feels stuck, it may need cleaning or replacement.

7. What tools do I need to fix a P1491 code on a Subaru?

Basic tools like a wrench or socket set, a vacuum gauge for testing, and possibly replacement parts such as a new PCV valve or hoses.

8. How much does it cost to fix a P1491 code on a Subaru?

The cost typically ranges from $10 to $50 for a PCV valve replacement, but labor costs can increase the total if done by a mechanic.

9. Can a dirty air filter cause the P1491 code?

A dirty air filter is unlikely to directly cause the code, but it can contribute to poor engine ventilation, which may worsen PCV system issues.

10. Does clearing the P1491 code fix the problem?

Clearing the code doesn’t fix the underlying issue. You must address the root cause, such as replacing the PCV valve or repairing damaged hoses, to resolve it permanently.

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