AutoCodes – Subaru – P0411 Subaru

P0411 Subaru Code - Secondary Air Injection System Incorrect Flow Detected

Quick Answer

An air pump is used on the vehicle to lower tail pipe emissions on start-up. Common causes include Faulty Vacuum hoses damaged, Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted. 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: P0411 Subaru indicates Secondary Air Injection System Incorrect Flow Detected.
Common causes: Common causes include Faulty Vacuum hoses damaged, Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted.
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.

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Code Popularity 6,483

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0411 Subaru Description

An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.

OBDII Code P0411 Subaru - Secondary Air Injection System Incorrect Flow Detected - AutoCodes.com — P0411 Subaru Code - Secondary Air Injection System Incorrect Flow Detected

What does this mean?

What are the Possible Causes of the DTC P0411 Subaru?

Faulty Vacuum hoses damaged
Faulty Air Pump inoperative
Air bypass solenoid harness is open or shorted
Air bypass solenoid circuit poor electrical connection
Air bypass solenoid leaking/blocked or stuck open/closed
Air diverter valve leaking/blocked or stuck open/closed

How to Fix the DTC P0411 Subaru?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0411 Subaru 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 P0411 Subaru 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 P0411 Subaru Code

1. What are common symptoms of OBDII code P0411 in a Subaru related to the Secondary Air Injection System?

The common symptoms include the illumination of the check engine light, rough idling, decreased engine performance, and potential exhaust emissions issues.

2. What are the possible causes of OBDII code P0411 in a Subaru?

Possible causes include a faulty secondary air injection pump, a blocked or restricted air injection system, damaged hoses or valves, or electrical issues within the system.

3. How can I diagnose the cause of OBDII code P0411 in my Subaru?

You can diagnose the issue by visually inspecting the air injection system components, checking for vacuum leaks, testing the secondary air pump, and scanning for additional trouble codes that may provide more information.

4. Can I continue driving my Subaru with OBDII code P0411?

It is not recommended to drive your Subaru with code P0411 as it can lead to reduced engine performance and potential damage to other components. It is best to address the issue promptly.

5. How can I repair OBDII code P0411 in my Subaru?

Repair options include replacing the secondary air injection pump, clearing any blockages in the air injection system, repairing or replacing damaged hoses or valves, and addressing any electrical issues.

6. Are there any maintenance tips to prevent OBDII code P0411 from occurring in my Subaru?

Regularly inspecting and maintaining the secondary air injection system, checking for loose or damaged components, and ensuring proper electrical connections can help prevent code P0411 from occurring.

7. Can a DIY enthusiast fix OBDII code P0411 in a Subaru?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address code P0411 by following repair guides and using appropriate diagnostic equipment. However, professional assistance may be recommended for complex issues.

8. Will resetting the check engine light resolve OBDII code P0411 in my Subaru?

Simply resetting the check engine light will not resolve the underlying issue causing code P0411. It is essential to diagnose the problem, make necessary repairs, and clear the trouble codes to address the problem effectively.

9. How much does it cost to repair OBDII code P0411 in a Subaru?

The cost of repairing code P0411 can vary depending on the exact cause of the issue, labor rates in your area, and whether you choose OEM or aftermarket parts. It is advisable to obtain estimates from reputable mechanics or repair shops.

10. Can OBDII code P0411 in a Subaru cause emissions testing failure?

Yes, OBDII code P0411 can cause your Subaru to fail emissions testing due to incorrect flow detected in the secondary air injection system, leading to increased emissions. It is crucial to address the issue before undergoing emissions testing.