The P0492 trouble code indicates that the secondary air injection (AIR) system on bank 2 is detecting insufficient airflow. The secondary AIR system assists in reducing emissions during cold engine startup by injecting fresh air into the exhaust system to aid in the combustion of unburned fuel.
Secondary Air Injection System Insufficient Flow (Bank 2)
Code symptoms P0492.
1. Illumination of the “Check Engine” or “Service Engine Soon” light on the dashboard.
2. Increased emissions.
3. Engine may run rough or hesitate during cold starts.
4. Decreased fuel efficiency.
5. Possible sulfur smell from the exhaust.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0492.
1. Clogged or restricted secondary AIR passages.
2. Malfunctioning secondary AIR pump.
3. Faulty AIR system valves.
4. Wiring or connector issues in the AIR system circuit.
5. Vacuum leaks in the AIR system hoses.
6. Faulty AIR system pressure sensor.
Code Solutions P0492.
1. Inspect the secondary AIR passages for any blockages or restrictions. Clean or replace components as necessary.
2. Test the secondary AIR pump for proper operation. Replace the pump if it is defective.
3. Check the AIR system valves for proper functioning. Replace any faulty valves.
4. Inspect the wiring and connectors associated with the AIR system for damage or corrosion. Repair or replace damaged components.
5. Check for vacuum leaks in the AIR system hoses and repair as needed.
6. Test the AIR system pressure sensor using a multimeter to ensure it is functioning correctly. Replace the sensor if it is faulty.
7. Clear the trouble codes and perform a test drive to verify that the issue has been resolved.
8. If the problem persists, further diagnosis may be needed to identify the root cause of the issue. Consulting a qualified mechanic or performing additional tests using diagnostic equipment may be necessary.