Secondary Air Injector Blues

  • July 14, 2016
  • Niazi Helou
  • Director
  • 0 Comments

Air Injection System Explained

In recent times we have had increased inquiries relating to Subaru's air injection system.

Some questions asked include:

  • What is the purpose of the air pump system?
  • How does it work?
  • What are error codes PO410, PO413, PO414, PO418, P1410, P1418, P2432, P2433, P2440, P2441, and P2444?
  • How do I fix this system when it fails?
  • Are there alternative cost effective ways to fix the Secondary Air Injection System?
To understand Subaru's Secondary Air Injection system, we must look at manufacturer's requirements in complying with Euro emission regulations for the particular year each vehicle is sold. In Australia we first saw this system on Subaru's MY06 XT Forester and MY06 2.0R Impreza. While EURO 4/5 standards were not mandatory here at that time, Australian models were fitted with this system in anticipation of expected emission law changes the following year.

What is the purpose of the air pump system?

In summary, the purpose of the Secondary Air Injection is to achieve lower cold start emissions by promoting earlier exhaust Catalyst Function.
How does it work?
When your car is started cold, an air pump located behind the vehicle's battery is activated by the ECU "Engine Management System" and via a complicated system of valves and sensors, ambient air is pumped into the exhaust stream through the lower section of the cylinder head. This "tricks" the catalytic converter into activating immediately rather than when the engine is warmed up, the result being cleaner cold start exhaust emissions. Once the engine has reached operating temperature, the valves close and the system checks for complete closure before switching off the pump. Unfortunately, with age, one or another of the many components of this system fails, often soon after warranty expires, and repairs can be prohibitively expensive. This happens in around 80 percent of Subaru vehicles in the third or fourth year of ownership. Subaru-Inyection-System-Diagram

What are Error Code PO410, PO413, PO414, PO418, P1410, P1418, P2432, P2433, P2440, P2441 and P2444?

There is rarely just one reason for any particular Diagnostic Trouble Code (DTC) coming up. There are several options to consider before changing some of the very expensive parts related to the code; for example, is the problem mechanical or electrical? Or is there a malfunction in a particular part or is the DTC triggered from another system? We advise reviewing all data related to the system to ensure correct function, then force activating individual components to check functionality.
  • Subaru secondary Air pump: 14828AA050, 14828AA060, 14828AA040, 14828AA030
  • Subaru combination valves: 14845AA220, 14864AA020
  • Subaru relay: 25332AA090
  • Subaru air pressure sensor: 14854AA230, 14864AA030

Are there any cost effective ways to fix the Secondary Air Injection System?

Yes, in most cases we can dramatically reduce the repair cost for this system.
There are two ways to make the problem go away.
  • The first is to diagnose and replace the faulty parts, leaving the system fully operational, but liable to future problems and repairs. This is the most expensive option.
  • The second is to turn off the system in one of two ways: a. The ECU (Engine Control Unit) can be reprogrammed to ignore the system, b. A software bypass loop can be written into the programming to turn off the warnings. In both cases your Subaru will continue to operate normally in every respect, except with slightly higher exhaust emissions in the first few minutes of operation from cold.

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