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The secondary air injection (SAI) system supplies ambient air to the exhaust manifold or catalytic converter to burn up exhaust emissions during engine warm-up. Airflow in the SAI system is routed through solenoids, check valves, and switching valves, which are operated by the powertrain control module (PCM). If the PCM detects an issue with the switching valve, on-board diagnostics will log a P0414 code.

What Does the P0414 Code Mean?

Diagnostic trouble code (DTC) P0414 stands for “Secondary Air Injection System Switching Valve ‘A’ Circuit Shorted.”

The SAI system has a pump that distributes air to a nozzle in each exhaust port in the cylinder head, which provides equal air injection for the exhaust for each cylinder.

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car sai pump part of the sai system
The SAI system has a pump that distributes air to a nozzle in each exhaust port in the cylinder head, which provides equal air injection for the exhaust for each cylinder.

During cold engine start-up, the air is routed to the exhaust manifolds via the check valves, preventing exhaust emissions from infiltrating the switching solenoids and air pump. Once the engine achieves a closed loop, the air is then directed to the catalytic converter.

Valves in the SAI system, including the switching valve, are essential in preventing exhaust emissions from destroying the air pump. A problem with the switching valve can trigger a P0414 code.

Note: The definition of code P0414 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0414 Code?

What are the Common Symptoms of the P0414 Code?

How to Diagnose the P0414 Code

Although the P0414 is a generic powertrain code, keep in mind that the steps for diagnosis and repair can vary, depending on vehicle specifications.

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Diagnosing this kind of code might require you to use a scan tool and inspect the affected system for visible signs of damage. That can be confusing if you’re not well-versed in automotive repair. If you’re not confident with your DIY skills yet, it’s best to have a certified mechanic do the job for you instead. Otherwise, you can go ahead and do the job on your own.

How to Fix the P0414 Code

Without the right tools and advanced technical knowledge, it can be difficult to resolve a P0414 code on your own. It can even lead to further complications and expensive repair costs if done incorrectly. To ensure that all steps and protocols are followed correctly, you can always get help from a trained professional.

But if you’ve already had some experience in resolving DTCs, then you’re well aware that having vehicle-specific repair information is crucial to fix the issue. Make sure to consult guides like those from Chilton or an ALLDATA subscription if you want to clear the code on your own.

About The Authors
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Contact Center Manager and Technical Reviewer at CarParts.com

William “Bill” Guzenski has produced hundreds of how-to videos for the automotive community. He’s an ASE Certified Master Automobile Technician, and is affiliated with the Specialty Equipment Market Association (SEMA). He loves attending race events and car shows throughout the country, as well as traveling in his 40-foot motorhome, exploring abandoned mines and ghost towns.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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