P0419 Secondary Air Injection System Relay B Circuit Malfunction 2

OBD-II Code P0419: This code indicates a malfunction in the secondary air injection system relay B circuit. The secondary air injection system is responsible for reducing emissions by injecting fresh air into the exhaust stream to help burn off excess hydrocarbons.

Definition of OBD2 Code P0419: The P0419 code is triggered when the Engine Control Module (ECM) detects an issue with the electrical circuit controlling the secondary air injection relay B. This could be due to a faulty relay, wiring issues, or a problem with the ECM itself.

p0419 – secondary air injection system relay B circuit malfunction 2

Typical severity: Moderate

Common Causes

P0419 – Secondary Air Injection System Relay B Circuit Malfunction 2

Common Causes:

• Faulty secondary air injection pump relay
• Corroded or damaged wiring related to the relay circuit
• Loose or poor connection at the relay or related components
• Defective secondary air injection pump
• Issues with the powertrain control module (PCM)

 

Common Misdiagnosis

OBD2 Code: P0419

Description: Secondary Air Injection System Relay B Circuit Malfunction 2

Common Misdiagnosis: Replacing the air injection pump without checking the relay or wiring issues.

 

Common Diagnostic Steps

OBD2 Code: P0419

Description: Secondary Air Injection System Relay B Circuit Malfunction 2

• Check the fuse related to the secondary air injection system relay.
• Inspect the wiring and connectors for any signs of damage or corrosion.
• Test the relay itself to ensure it is functioning properly.
• Verify that there is power and ground at the relay terminals.
• Examine the secondary air pump for proper operation.
• Use a scan tool to check for any additional codes that may indicate other issues with the system.
• If necessary, replace faulty components such as relays, wiring, or pumps.