P0413 OBD-II Trouble Code: Secondary Air Injection System Switching Valve A Circuit Open

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Cost of diagnosing the P0413 code

P0413 is a diagnostic trouble code (DTC) for "Secondary Air Injection System Switching Valve A Circuit Open". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
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Toyota$20.00
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P0412 trouble code definition

A P0412 trouble code is related to a vehicle’s air injection system designed to reduce emissions by injecting fresh air directly into the exhaust system. This allows for a fuller combustion of exhaust gases and is not found on every modern, OBD-II vehicle.

What the P0412 code means

P0412 is an OBD-II generic code for a voltage problem with the air injection system. Most systems send voltage readings to the engine control module and if those readings are out of the manufacturer’s parameters, the system will be deemed defective and a Check Engine Light will be illuminated.

What causes the P0412 code?

Because an air injection system can be affected by ambient temperatures, the system itself isn’t always the cause. If the one-way check valve breaks or gets worn out, it can allow condensation to build up inside the injection pump that will freeze in cold weather. Other likely causes can be:

  • A faulty air injection pump.
  • Faulty wiring to and from the pump.
  • Faulty air bypass solenoid harness

What are the symptoms of the P0412 code?

If you have a P0412, chances are high you’ll hear an audible noise from the pump itself. Poor performance under acceleration will also be a symptom. Because most pumps operate during startup and idling, the engine may stall with a P0412 or have trouble starting.

How does a mechanic diagnose the P0412 code?

Firstly, your mechanic will visually inspect all the associated wiring for the air injection system and repair as necessary. After clearing the code, a test drive will reveal if the P0412 returns immediately. If it doesn’t, the issue could be intermittent or temperature dependent. If it does return, a fuse may be blown and your mechanic will check that next. If the fuse is fine, chances are high the pump itself is defective and will need to be replaced.

Common mistakes when diagnosing the P0412 code

Some drivers will fail to inspect and repair the one-way check valves inserted in the hoses leading to the exhaust pipe. If the pump is replaced with a still defective valve, chances are high the pump will fail shortly after.

How serious is the P0412 code?

While most emissions control codes are not very severe, a P0412 will often cause adverse driving conditions. Some vehicles may have difficulty driving to a repair shop, requiring the assistance of mobile mechanics to fix the problem where the vehicle is parked.

What repairs can fix the P0412 code?

The most common repairs for a P0412 are as follows:

  • Replacing damaged wiring to the air injection system.
  • Replacing a faulty air injection pump.
  • Inspecting and repairing one-way check valves.

Additional comments for consideration regarding the P0412 code

If you have a P0412 code, chances are high you’re driving a Volkswagen. Other European manufacturers frequently use these air injection systems to control emissions. If you have one, look into fabricating a water drain system to ensure the check valves do not freeze during the winter.

Need help with a P0412 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.

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