If you’re a Toyota driver and your vehicle is displaying a P0412 error code, this article is for you. We will provide you with two practical solutions to fix this error code at home.
First, use the Zeus app to scan your vehicle and identify the error code P0412. This particular code indicates that the engine control module detected that the engine oxygen sensor did not detect an increase in the oxygen level in the exhaust when the air injection system was commanded on during an active test.
Solution 1: Air Injection Pump
Start by locating the air injection pump at the front of the engine with a serpentine belt wrapped around it. Carefully remove the air injection pump from your engine and visually inspect the pump pipe and the connector for any damages. Use a multimeter to test the air injection pump. The standard resistance should be close to zero ohms. If you get a high resistance reading, this indicates that the air injection pump is faulty and needs to be replaced.
Solution 2: Oxygen Sensor
Oxygen sensors are mounted directly onto the exhaust pipe near the catalytic converter. Locate the sensor that responds too slow as it ages. Replace the oxygen sensor if necessary.
After applying these solutions, you can use the Zeus app to clear the error code and rescan your vehicle to ensure everything is functioning properly.
What does the P0412 error code indicate for Toyota vehicles?
The P0412 error code indicates that the engine control module detected that the engine oxygen sensor did not detect an increase in the oxygen level in the exhaust when the air injection system was commanded on during an active test.
What are the two practical solutions to fix the P0412 error code at home?
The two practical solutions are: Method A – Inspecting and testing the air injection pump for any damages and replacing it if faulty. Method B – Inspecting the oxygen sensor and replacing it if it responds too slow due to aging.
How can I verify that the air injection pump is faulty?
To verify if the air injection pump is faulty, carefully remove it from the engine, visually inspect its pump pipe and connector for damages, and use a multimeter to test its resistance. A high resistance reading indicates a faulty air injection pump that needs to be replaced.
Where are the oxygen sensors located in Toyota vehicles?
Oxygen sensors are mounted directly onto the exhaust pipe near the catalytic converter in Toyota vehicles.
How can I clear the error code P0412 after the repair?
After the repair, you can use the Zeus app to clear the error code and then tap the rescan button to ensure that everything is fine with your vehicle.