P2434 Fault Code

Secondary Air Injection System Air Flow/Pressure Sensor Circuit Intermittent/Erratic Bank 1

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

The P2434 fault code indicates an issue with the secondary air injection system's air flow or pressure sensor circuit on Bank 1. This system is responsible for injecting air into the exhaust stream to help reduce emissions during cold starts. An intermittent or erratic signal from the sensor can lead to functionality issues, causing increased emissions and potential engine performance problems.

What are the symptoms of the P2434 code?

Symptoms that may be associated with the P2434 code include:

• Illuminated check engine light
• Reduced engine performance
• Increased emissions or failed emissions tests
• Unusual engine noises due to the malfunctioning secondary air injection system.

What causes the P2434 code?

Common causes for the P2434 code include:

• Faulty secondary air injection system air flow or pressure sensor
• Wiring issues such as frayed wires or poor connections in the sensor circuit
• Vacuum leaks in the secondary air injection system
• Malfunctioning secondary air pump
• Issues with the engine control module (ECM) affecting sensor readings.

How to fix P2434?

To resolve the P2434 fault code, you can follow these steps:

1. Inspect the air flow or pressure sensor for proper functionality.
2. Check the wiring and connectors in the sensor circuit for damage or corrosion.
3. Look for vacuum leaks in the secondary air injection system.
4. Test the secondary air pump to ensure it operates correctly.
5. Replace any faulty components, such as the sensor or air pump, as needed.
6. Clear the fault codes and test drive the vehicle to see if the code returns.