P0410: Secondary Air Injection System

What does P0410 mean?

Some vehicles use an air pump to blow fresh air into the exhaust during cold starts. This helps the catalytic converter warm up and reduces emissions. When the system does not work as expected, the ECM stores P0410.

Both references list the air pump, its relay, the check valves, the control valves and blocked or damaged hoses and passages as common causes.

Common symptoms

• Check engine light on
• Loud or unusual air pump noise
• Often no change in how the car drives

Common causes

The causes below are the ones commonly seen with P0410. The actual cause can vary by vehicle, engine and mileage, so treat this list as a starting point, not a diagnosis.

• A failed secondary air pump
• A faulty pump relay or fuse
• Faulty or stuck check valves
• Faulty control or switching valves, or damaged vacuum lines
• Blocked air passages, often from carbon

What to check with a scanner

• Listen for the pump running for a short time after a cold start.
• Check the readiness screen. The secondary air monitor, where fitted, must run after a repair.
• Note companion codes such as P0411 or pump circuit codes.
• Read freeze frame data to confirm the code set during a cold start.

How to read and clear P0410 with OBD Master Pro

1. Plug in your adapter. Connect a generic ELM327 (or ELM329) OBD2 adapter to the diagnostic port, usually under the dashboard on the driver's side. Bluetooth Classic, Bluetooth LE, Wi-Fi and USB OTG adapters are supported.
2. Switch the ignition on. Turn the key to ON or start the engine, depending on your car.
3. Connect in OBD Master Pro. Open the app, go to Connection and pick your adapter. Classic Bluetooth adapters connect from the Bluetooth tab, Bluetooth LE adapters from the BLE tab with no pairing needed. Use the generic OBD2 / EOBD profile or your car's brand profile.
4. Read the codes. Open the fault codes screen to see stored, pending and permanent codes. Confirm P0410 is listed and note any other codes, since they often explain the cause.
5. Check the details. Look at freeze frame data, Live data and, where your car supports it, Mode 06 test results (see the checks above).
6. Fix, then clear. After the repair, clear the codes to turn off the check engine light. Clearing also resets the emissions readiness monitors, so drive normally and check the readiness screen before any inspection. Permanent codes cannot be erased with a scan tool; they clear on their own once the car's self test passes.

Tip: you can also look up P0410 and other codes in the app's DTC search without connecting to a car. If your adapter will not connect, use Connection > Share connection log and email it to support. Many cheap ELM327 clones only handle basic engine OBD2, which is all you need for P0410.

When to see a mechanic

Get professional help if any of these apply:

• The pump is very noisy or does not run
• Check valves need testing
• Passages need cleaning

If you are unsure, a qualified technician can confirm the cause with tests such as smoke testing, pressure testing or scope readings. Clearing a code does not repair the fault.

Related trouble codes

See all OBD2 trouble code guides

Related guides

Check engine light on: what to do · How to read an OBD2 code (P, B, C, U) · Stored, pending and permanent codes and freeze frame · OBD2 readiness monitors explained · OBD2 glossary · OBD2 by car brand