P2437 Fault Code

Secondary Air Injection System Air Flow/Pressure Sensor Circuit Low Bank 2

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

• The P2437 fault code indicates an issue with the secondary air injection system's air flow or pressure sensor circuit for Bank 2.
• This system is designed to reduce emissions by injecting air into the exhaust stream to help burn off excess hydrocarbons, particularly during cold starts.
• When the air flow or pressure sensor detects an abnormal reading, it can trigger the check engine light and lead to increased emissions.

What are the symptoms of the P2437 code?

• Check engine light illuminated on the dashboard.
• Possible increase in exhaust emissions due to improper air injection.
• Poor engine performance or rough idling in some cases.
• In some vehicles, you might notice unusual noises when the secondary air injection system is activated.

What causes the P2437 code?

• A faulty secondary air injection system air flow or pressure sensor.
• Wiring issues including short circuits, open circuits, or corrosion.
• Blockage or malfunction within the secondary air injection system itself.
• Vacuum leaks or issues with the intake system affecting sensor readings.

How to fix P2437?

• Inspect the secondary air injection system components, including the air flow or pressure sensor.
• Check wiring and connectors for signs of damage or corrosion.
• Replace the faulty sensor if it is determined to be defective.
• Clear the fault code from the ECU and conduct a test drive to ensure the issue does not reoccur.
• If necessary, inspect and repair any blockages or leaks in the air injection system.