AutoCodes – Subaru – P1418 Subaru

P1418 Subaru Code - Secondary Air Injection System Control 'A' Circuit Shorted

Quick Answer

P1418 Subaru indicates Secondary Air Injection System Control 'A' Circuit Shorted. Common causes include Faulty Air Switching Valve, Air Switching Valve harness is open or shorted, Air Switching Valve circuit poor electrical connection. 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: P1418 Subaru indicates Secondary Air Injection System Control 'A' Circuit Shorted.
Common causes: Common causes include Faulty Air Switching Valve, Air Switching Valve harness is open or shorted, Air Switching Valve circuit poor electrical connection.
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.

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Code Popularity 3,979

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Aug 21, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1418 Subaru Description

OBDII Code P1418 Subaru - Secondary Air Injection System Control 'A' Circuit Shorted - AutoCodes.com — P1418 Subaru Code - Secondary Air Injection System Control 'A' Circuit Shorted

What does this mean?

What are the Possible Causes of the DTC P1418 Subaru?

Faulty Air Switching Valve
Air Switching Valve harness is open or shorted
Air Switching Valve circuit poor electrical connection

How to Fix the DTC P1418 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 P1418 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 P1418 Subaru 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 P1418 Subaru Code

1. What does the OBDII code P1418 mean on a Subaru?

P1418 indicates a problem with the Secondary Air Injection System Control 'A' Circuit, specifically a short in the circuit.

2. What are the symptoms of a P1418 code on a Subaru?

Common symptoms include a check engine light, failed emissions tests, and potentially reduced fuel efficiency. You may not notice any significant drivability issues.

3. What causes the P1418 code to trigger on a Subaru?

The most common causes are a shorted or damaged wiring harness, a faulty air pump relay, a malfunctioning secondary air injection pump, or corroded electrical connections.

4. How can I diagnose the P1418 code on my Subaru?

Start by inspecting the wiring and connectors for damage or corrosion. Use a multimeter to test the air pump relay and control circuit for continuity and proper voltage.

5. Can I drive my Subaru with a P1418 code?

While the vehicle may still be drivable, itâ€™s not recommended as the secondary air injection system is crucial for reducing emissions. Driving with this code may lead to environmental non-compliance and worsen the issue.

6. What repairs can fix the P1418 code on a Subaru?

Repairs may include replacing damaged wiring, cleaning or repairing corroded connectors, replacing the air pump relay, or replacing the secondary air injection pump if faulty.

7. How much does it cost to fix the P1418 code on a Subaru?

Repair costs can vary, but replacing a relay or fixing wiring may cost $100-$300, while replacing the air pump could cost $400-$800, depending on labor rates and parts pricing.

8. Can a bad fuse cause the P1418 code?

Yes, a blown fuse in the secondary air injection system circuit can cause the P1418 code. Check the fuse box for any blown fuses and replace them if necessary.

9. Is the P1418 code specific to Subarus?

No, the P1418 code is a standard OBDII code and can appear on other vehicles, but the components and repair procedures may differ between manufacturers.

10. Will clearing the P1418 code fix the issue?

Clearing the code with a scan tool may temporarily turn off the check engine light, but if the root cause isnâ€™t resolved, the code will reappear. Always address the underlying problem.