The OBD code P0412 for Toyota indicates a Secondary Air Injection System Switching Valve A Circuit Malfunction.
This affects the secondary air injection system.
Symptoms include the Engine Light being ON, engine hesitation.
Causes may include a faulty air pump, open/shorted air bypass solenoid harness, or poor electrical connection.
It is a moderate issue.
A possible fix is to inspect and repair any damaged components or wiring connections related to the air bypass solenoid circuit.
| Repair Importance Level | 6.67 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 6.67 (Out of 10) |
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Symptoms of the Toyota p0412 OBD Code
The vehicle may exhibit a secondary air injection system switching valve A circuit malfunction.
- Symptoms: Engine Light ON.
- Engine hesitation.
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Causes of the Toyota p0412 OBD Code
Possible reasons for fault code P0412 on a Toyota include issues with the secondary air injection system.
- P0412 can be caused by a faulty Air Pump inoperative.
- An open or shorted Air bypass solenoid harness.
- A poor electrical connection in the Air bypass solenoid circuit.
Fixing Toyota Error Code p0412 Step By Step
Inspect the secondary air injection system for any leaks or blockages causing fault code P0412.
- To fix Toyota OBDII code P0412, first, review the ‘Possible Causes’ mentioned above and visually examine the corresponding wiring harness and connectors.
- Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Next, check the operation of the secondary air injection system components such as the air pump, hoses, and valves for any faults or blockages.
- Test the secondary air injection system for proper operation and check for any leaks in the system.
- Replace any faulty components found during the inspection.
- Clear the fault code from the vehicle’s computer using a scan tool.
- Finally, perform a test drive to verify that the code does not return, indicating a successful repair.
Cost Of Fixing Toyota p0412 Fault Code
The repair for fault code P0412 on a Toyota typically involves diagnosing and fixing the secondary air injection system.
The cost to diagnose and fix a Toyota OBD code P0412 typically ranges from $75 to $150 per hour for labor rates.
With an estimated repair time of 1. 0 hour, the total cost can be around $75 to $150, depending on shop rates and the complexity of the issue.
Details of the Toyota p0412 OBD Code
Code P0412 in Toyota indicates an issue with the secondary air injection system circuit malfunction.
Code P0412 for Toyota vehicles means that the Secondary Air Injection System Switching Valve A Circuit Malfunction has been detected.
This code is triggered by the Engine Control Module (ECM) when it detects an improper voltage signal from the Secondary Air Injection System Switching Valve A.
The Secondary Air Injection System helps reduce emissions by injecting fresh air into the exhaust system to help burn off any remaining fuel before it exits the tailpipe.
Mechanic’s Tech Notes
Detailed information on diagnosing and repairing fault code P0412 in Toyota vehicles.
OBDII code P0412 in a Toyota indicates an issue with the Secondary Air Injection System switching valve A circuit.
To diagnose, use a voltmeter to check for power and ground at the switching valve connector.
Inspect the wiring for any damage or corrosion.
Test the switching valve operation using a scan tool to see if it responds properly.
If the valve doesn’t function correctly, it may need replacement.
Additionally, check the air injection pump for proper operation.
Clear the code after repairs and test drive to ensure the issue is resolved.
FAQ
The common cause of OBD code P0412 in a Toyota vehicle is a faulty air pump inoperative or issues with the air bypass solenoid circuit.
Diagnose P0412 in Toyota: Symptoms Engine Light ON, Engine hesitation. Causes Faulty Air Pump, Air bypass solenoid issues. Fix Inspect wiring harness, connectors for damage.
Address the issue immediately. Driving with code P0412 can lead to engine hesitation. Check the air pump, solenoid harness, and connections for faults.
Wrap Up
If your Toyota triggers OBDII code P0412, you may notice poor engine performance, rough idling, or increased emissions.
This code typically indicates a malfunction in the secondary air injection system, possibly caused by a faulty air pump, damaged wiring, or a failed air pump relay.
To address Toyota OBDII code P0412, start by inspecting the air pump, relay, and associated wiring for any visible damage or loose connections.
Test the components for proper operation and replace any faulty parts as needed to restore the secondary air injection system’s functionality.
