P1423 Secondary Air Injection System Bank 1 Insufficient Flow Detected

Definition: The OBD2 code P1423 indicates that the secondary air injection system on bank 1 is not providing enough airflow as detected by the vehicle’s engine control module (ECM).

p1423 secondary air injection system bank 1 insufficient flow detected

Typical severity: Moderate

Common Causes

p1423 – Secondary air injection system bank 1 insufficient flow detected

• Common causes:
• – Faulty secondary air pump
• – Blocked or restricted secondary air passages
• – Faulty one-way check valve in the secondary air system
• – Leaks in the secondary air system hoses or pipes
• – Electrical issues such as blown fuses or damaged wiring in the secondary air system circuit

Common Misdiagnosis

OBD2 Code: P1423

Description: Secondary Air Injection System Bank 1 Insufficient Flow Detected

Common Misdiagnosis: Replacing the air pump without checking for clogged or damaged hoses, faulty check valves, or issues with the air injection solenoid.

Common Diagnostic Steps

OBD2 Code: P1423

Description: Secondary Air Injection System Bank 1 Insufficient Flow Detected

• Check for any stored trouble codes and freeze frame data using an OBD2 scanner.
• Inspect the secondary air injection pump for proper operation and listen for unusual noises.
• Examine air injection hoses and lines for cracks, leaks, or disconnections.
• Test the air injection check valves to ensure they are not stuck open or closed.
• Verify that the vacuum supply to the system is adequate and free of leaks.
• Inspect electrical connections and wiring related to the secondary air injection system for damage or corrosion.
• Perform a smoke test to identify any hidden leaks in the system.
• If applicable, check the relay and fuses associated with the secondary air injection pump.