What Does P0410 Mean?
The Secondary Air Injection (AIR) system has been detected as malfunctioning. Despite the database description referencing EGR sensor B, P0410 is officially the Secondary Air Injection system malfunction code. The AIR system pumps fresh air into the exhaust during cold starts to help the catalytic converter reach operating temperature faster. The driver may notice a slightly rougher cold start or increased emissions, and the vehicle will fail emissions testing.
Common Causes
30%
Failed secondary air injection pump — motor burned out or seized
25%
AIR pump relay failure or control circuit fault
20%
Check valve stuck closed or AIR injection hoses disconnected/cracked
15%
Blocked AIR passages in the exhaust manifold or cylinder head
10%
AIR pump intake filter clogged or pump frozen in cold weather (moisture/ice)
Diagnostic Steps
1
Command the AIR pump relay on using bidirectional scan tool control — listen for the pump to activate. If the pump does not run, check the relay, fuse, and power supply circuit.
2
If the pump runs, check for airflow output at the pump outlet by feeling for air or using a flow meter. A running pump with no output indicates an internal pump failure or blocked outlet.
3
Inspect the AIR check valve(s) — they should allow airflow in one direction only (toward the exhaust). A stuck-closed check valve blocks all secondary air. Remove and test by blowing through it.
4
Check the AIR hoses for cracks, disconnections, or collapsed sections. These rubber hoses deteriorate from heat exposure near the exhaust.
5
On vehicles with AIR passages in the cylinder head or exhaust manifold, verify the passages are not carbon-clogged by removing the AIR pipe at the exhaust and checking for flow restriction.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The Secondary Air Injection (AIR) system has been detected as malfunctioning. Despite the database description referencing EGR sensor B, P0410 is officially the Secondary Air Injection system malfunction code. The AIR system pumps fresh air into the exhaust during cold starts to help the catalytic c...
The most common cause of P0410 (Exhaust Gas Recirculation Sensor B Circuit High) is: Failed secondary air injection pump — motor burned out or seized
Typical repair costs for P0410 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. The secondary air system only operates during cold starts for emissions reduction. Its failure does not affect engine performance or safety during normal driving. The vehicle will fail emissions testing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0410 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control / Secondary Air Injection
Difficulty
Type
Generic (SAE)
Recommended Tools
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