P0416 Fault Code

Secondary Air Injection System Switching Valve B Circuit Open

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0416 fault code indicates that there is an issue with the Secondary Air Injection System Switching Valve B Circuit. This system is designed to reduce emissions by injecting air into the exhaust stream, helping the catalytic converter to work more efficiently during cold starts. If the valve circuit is open or has a fault, it can lead to increased emissions and potential performance issues.

What are the symptoms of the P0416 code?

Common symptoms associated with the P0416 fault code are:

• Illuminated check engine light (CEL)
• Increased exhaust emissions, potentially failing emissions tests
• Rough engine idle or performance issues
• Audible air injection pump operation (if applicable)
• Potential decrease in fuel economy if other systems are affected.

What causes the P0416 code?

The primary causes of the P0416 code may include:

• A malfunctioning Secondary Air Injection Valve B
• Open or shorted wiring in the valve circuit
• Faulty electrical connectors or grounds
• A blown fuse related to the air injection system
• Issues with the engine control module (ECM) that controls the air injection system.

How to fix P0416?

To resolve the P0416 fault code, follow these steps:

1. Conduct a visual inspection of the air injection system, checking for damaged wires or connectors.
2. Test the Secondary Air Injection Valve B for proper operation; replace if faulty.
3. Inspect all related fuses and replace any that are blown.
4. Use a multimeter to ensure there are no open circuits in the wiring harness.
5. Clear the fault codes and perform a test drive to see if the issue reoccurs.