P0410 Code - Secondary Air Injection System Malfunction

What Does P0410 Mean?

OBD II fault code PO 410 refers to a fault or defect in the Secondary Air System, also known as the Secondary Air Injection System, that is fitted to some vehicles. The purpose of the system is to inject atmospheric air into the exhaust system during cold starts to assist in the oxidization, or burning off of uncombusted and/or partially combusted hydrocarbon molecules in the exhaust stream that result from incomplete combustion during cold starts, when most engines run on highly enriched air/fuel mixtures.

Secondary Air Systems typically consist of a relatively high-capacity air pump in the form of a turbine, a relay to control switching the pump motor on and off, a solenoid and check valve(s) to control air flow, as well various tubing and ducting configurations to suit the application. The image below shows a simplified schematic of a typical Secondary Air System layout.

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What are the common causes of P0410 ?

• Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
• Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
• Dirty air cleaner element Damaged DPF

How do you troubleshoot P0410 ?

• Replacing the air injection pump and power relay
• Replacing O2 sensors that respond too slow as they age
• Replacing the air injection pump intake filter clogged with debris

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