How is fault code P0410 fixed?

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. With the engine stone cold, start it and listen. The pump should run for the first half minute or so and make a clear whirring sound. Silence points at the pump, relay or fuse. A horrible grinding tells you the pump is full of water and finished 2. Pull the pump fuse and check the relay before you touch anything expensive. A blown fuse or dead relay is a quick win and people overlook it 3. Check the air hoses and the combi/check valve for splits, soot, water residue or a valve that's seized shut. A failed check valve is what lets moisture wreck the pump, so replacing the pump without sorting this just kills the new one 4. Use live data during an active air injection test if your scanner supports it, watching the oxygen sensor lean out when the air kicks in. No change means the air isn't reaching the exhaust 5. Back-probe the pump connector for voltage when the system commands the pump on. No voltage with a good fuse and relay points at wiring or the control side

Secondary Air Injection System Malfunction

Jump to the fix

Severity

Low

Can I keep driving?

Usually drivable; have it fixed at the first opportunity.

First step

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. With the engine stone cold, start it and listen. The pump should run for the first half minute or so and make a clear whirring sound. Silence points at the pump, relay or fuse. A horrible grinding tells you the pump is full of water and finished 2.

PPowertrain
0Generic code
4Emissions
10Sequence number

What does it 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.

Symptoms

Likely causes

How to fix it

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.