AutoCodes – Subaru – P0416 Subaru

P0416 Subaru Code - Secondary Air Injection System Switching Valve 'B' Circuit Open

Quick Answer

An air pump is used on the vehicle to lower tail pipe emissions on start-up. Common causes include Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted, Air bypass solenoid circuit poor electrical connection. 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: P0416 Subaru indicates Secondary Air Injection System Switching Valve 'B' Circuit Open.
Common causes: Common causes include Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted, Air bypass solenoid circuit poor electrical connection.
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 4,538

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 Apr 18, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0416 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 P0416 Subaru - Secondary Air Injection System Switching Valve 'B' Circuit Open - AutoCodes.com — P0416 Subaru Code - Secondary Air Injection System Switching Valve 'B' Circuit Open

What does this mean?

What are the Possible Causes of the DTC P0416 Subaru?

Faulty Air Pump inoperative
Air bypass solenoid harness is open or shorted
Air bypass solenoid circuit poor electrical connection

How to Fix the DTC P0416 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 P0416 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.

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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 P0416 Subaru Code

1. What does OBDII code P0416 for Subaru mean?

The OBDII code P0416 for Subaru indicates a problem with the Secondary Air Injection System Switching Valve 'B' circuit being open, which can affect the proper operation of the system.

2. What are the common symptoms of a P0416 error code in a Subaru?

Common symptoms of a P0416 error code in a Subaru may include the check engine light illuminating, rough idling, poor acceleration, and increased emissions.

3. What are the possible causes of a P0416 error code in a Subaru?

Possible causes of a P0416 error code in a Subaru include a faulty Secondary Air Injection System Switching Valve 'B', damaged wiring or connectors in the circuit, or a problem with the engine control module (ECM).

4. How can I diagnose a P0416 error code in my Subaru?

Diagnosing a P0416 error code in your Subaru involves checking the Secondary Air Injection System Switching Valve 'B' for proper operation, inspecting the wiring and connectors for damage, and using a scan tool to read the error code and live data.

5. Can I drive my Subaru with a P0416 error code?

While it may be possible to drive your Subaru with a P0416 error code, it is not recommended as it can lead to reduced performance and increased emissions. It is best to address the issue promptly.

6. How can I repair a P0416 error code in my Subaru?

To repair a P0416 error code in your Subaru, you may need to replace the faulty Secondary Air Injection System Switching Valve 'B', repair any damaged wiring or connectors, and clear the error code using a scan tool.

7. Are there any DIY tips for fixing a P0416 error code in a Subaru?

While some aspects of diagnosing and repairing a P0416 error code in a Subaru can be done by DIY enthusiasts, it is recommended to consult a professional mechanic for proper diagnosis and repair to ensure the issue is resolved correctly.

8. How much does it cost to fix a P0416 error code in a Subaru?

The cost of fixing a P0416 error code in a Subaru can vary depending on the extent of the issue, the parts needed for repair, and the labor rates of the repair shop. It is advisable to get a few quotes from different mechanics.

9. Can a P0416 error code cause damage to my Subaru if left untreated?

Leaving a P0416 error code untreated in your Subaru can potentially lead to issues such as decreased engine performance, increased emissions, and further damage to the Secondary Air Injection System components over time.

10. How can I prevent a P0416 error code from occurring in my Subaru?

To prevent a P0416 error code in your Subaru, it is essential to follow the manufacturer's recommended maintenance schedule, address any check engine light issues promptly, and ensure proper care of the vehicle's emission control system.