P0492 Secondary Air Injection System Insufficient Flow Bank 2

Definition: The P0492 code indicates that the Engine Control Module (ECM) has detected an insufficient flow of air in the secondary air injection system for bank 2. This system is responsible for reducing emissions by injecting fresh air into the exhaust stream to help burn off excess hydrocarbons.

p0492 – Secondary Air Injection System Insufficient Flow Bank 2

Typical Severity: Moderate

Common Causes

P0492 – Secondary Air Injection System Insufficient Flow Bank 2

Common causes:

• Faulty secondary air injection pump
• Blocked or restricted secondary air injection system
• Leaking vacuum lines connected to the secondary air injection system
• Faulty one-way check valve in the secondary air injection system
• Electrical issues such as blown fuses or damaged wiring related to the secondary air injection system

 

Common Misdiagnosis

OBD2 Code: P0492

Description: Secondary Air Injection System Insufficient Flow Bank 2

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

 

Common Diagnostic Steps

OBD2 Code: P0492

Description: Secondary Air Injection System Insufficient Flow Bank 2

• Check for any stored codes and freeze frame data to understand the conditions under which the code was set.
• Inspect all related hoses and connections for leaks, blockages, or damage.
• Test the secondary air injection pump for proper operation. Ensure it is delivering adequate airflow.
• Examine the air injection check valves for clogs or malfunctioning components.
• Verify that the electrical connectors and wiring associated with the secondary air system are intact and free of corrosion or damage.
• Use a scan tool to activate the secondary air injection system and monitor its performance in real-time.
• If applicable, inspect and test any relevant fuses or relays associated with the secondary air injection system.
• If necessary, perform a smoke test to identify any vacuum leaks within the system.