AutoCodes – Toyota – P0419 Toyota

P0419 Toyota Code - Secondary Air Injection System Relay 'B' Circuit Malfunction

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: P0419 Toyota indicates Secondary Air Injection System Relay 'B' Circuit Malfunction.
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 34,090

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 P0419 Toyota 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 P0419 Toyota - Secondary Air Injection System Relay 'B' Circuit Malfunction - AutoCodes.com — P0419 Toyota Code - Secondary Air Injection System Relay 'B' Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0419 Toyota?

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

How to Fix the DTC P0419 Toyota?

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 P0419 Toyota 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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Need more information on how to fix the P0419 Toyota code? Get Access to Factory Service Manuals

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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 P0419 Toyota Code

1. What are the common symptoms of OBDII code P0419 in a Toyota?

- Common symptoms include the check engine light illuminating, rough idling, decreased engine performance, and potential emissions issues.

2. What causes the OBDII code P0419 in a Toyota?

- The code is triggered when the Engine Control Module (ECM) detects an open or short circuit in the secondary air injection system relay 'B' circuit.

3. How can I diagnose the OBDII code P0419 in my Toyota?

- Diagnosis involves using a scan tool to read the code, checking the secondary air injection system relay 'B' circuit for continuity, and inspecting the wiring for any damage or loose connections.

4. Can a faulty secondary air injection system relay 'B' circuit cause other problems in my Toyota?

- Yes, a faulty relay circuit can affect the proper functioning of the secondary air injection system, leading to decreased engine performance and potential emissions issues.

5. How can I repair the OBDII code P0419 in my Toyota?

- Repair typically involves replacing the faulty secondary air injection system relay 'B' circuit, ensuring proper connection and wiring, and clearing the error code with a scan tool.

6. Are there any DIY tips for fixing the OBDII code P0419 in a Toyota?

- While some DIY enthusiasts may attempt to replace the relay circuit themselves, it is recommended to consult a professional mechanic for proper diagnosis and repair to ensure the issue is resolved correctly.

7. Is it safe to continue driving my Toyota with the OBDII code P0419?

- It is not recommended to ignore the code and continue driving, as it can lead to further damage to the secondary air injection system and potentially affect the vehicle's performance and emissions.

8. How much does it typically cost to repair the OBDII code P0419 in a Toyota?

- Repair costs can vary depending on the extent of the issue, but replacing the secondary air injection system relay 'B' circuit typically ranges from $150 to $300, including parts and labor.

9. Will resetting the check engine light make the OBDII code P0419 go away?

- Simply resetting the check engine light will not fix the underlying issue causing the code. It is important to diagnose and repair the problem to prevent it from recurring.

10. Can a Toyota dealership help with diagnosing and repairing the OBDII code P0419?

- Yes, Toyota dealerships have trained technicians and specialized equipment to diagnose and repair OBDII codes like P0419 related to the secondary air injection system relay 'B' circuit malfunction.