P0410

Secondary Air Injection System Malfunction

OBD-II diagnostic trouble code P0410indicates a fault detected by the vehicle's onboard computer. This code applies to all OBD-II compliant vehicles and should be addressed promptly to avoid potential engine or emissions system damage.

Severity Level 3 — Moderate

This code indicates a moderate issue that may affect vehicle performance and fuel economy. Continued driving is possible in most cases, but prompt diagnosis and repair are recommended to prevent further damage.

Common Symptoms

• Check Engine Light on
• Failed emissions test
• Usually no driveability issues
• Whining noise from air pump on cold start (if pump failing)
• May hear air hissing if there is a leak in the system

Possible Causes

• Failed secondary air injection pump — electric motor seizes from water/moisture ingestion, very common on BMW, VW, Audi, and Volvo
• Faulty secondary air injection relay — contacts burn out from high current draw of pump motor
• Blown secondary air injection fuse
• Stuck-closed combination valve (check valve) — prevents air from reaching exhaust manifold
• Cracked or disconnected air injection hose — rubber hoses dry out and split over time
• Clogged secondary air passages in cylinder head (carbon buildup)

Common Fixes

• Replace secondary air injection pump ($300-800 including labor)
• Replace secondary air injection relay ($20-80)
• Replace blown fuse ($1-5)
• Replace combination/check valve ($80-300)
• Replace cracked or disconnected hoses ($30-200)
• Clean carbon-clogged air passages in cylinder head ($300-800 labor-intensive)

Estimated Repair Cost

These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.

Explore Repair Costs

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