Tundra P0412 and P0415: Secondary Air Injection System Malfunction
Symptoms
After purchasing a 2007 Toyota Tundra, the owner experienced an issue where the vehicle would shut off and display the following trouble codes:- P0412 SAIS Switching Valve A Circuit Malfunction Bank 1
- P0415 SAIS Switching Valve B
Causes
The P0412 and P0415 codes indicate a problem with the Secondary Air Injection System (SAIS), which is responsible for injecting air into the exhaust system during cold starts to help reduce emissions. Common causes of these codes include:- Faulty SAIS switching valve
- Damaged or clogged vacuum lines
- Electrical issues, such as broken wires or loose connectors
Diagnosis
To diagnose the issue, a mechanic will typically:- Inspect the SAIS switching valve and vacuum lines for damage or blockages
- Check the electrical connections to the SAIS system
- Perform a smoke test to identify any leaks in the vacuum system
Solutions
Depending on the diagnosis, repairs may include:- Replacing the SAIS switching valve
- Repairing or replacing damaged vacuum lines
- Fixing any electrical issues
Additional Tips
- Regular maintenance can help prevent SAIS issues, such as replacing the air filter and cleaning the throttle body.
- Using high-quality fuel can also help reduce emissions and improve the performance of the SAIS system.
- If you experience the P0412 or P0415 codes, it is important to have the issue diagnosed and repaired promptly to avoid further damage to the vehicle.
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