P2431 Fault Code
P2431 OBD-II Trouble Code Short Description
Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance Bank 1
What does trouble code P2431 mean?
The P2431 code indicates a problem with the secondary air injection system's air flow or pressure sensor circuit for Bank 1. This sensor is responsible for measuring the amount of air injected into the exhaust system during cold starts to help reduce emissions. If the signal from this sensor is out of range or not performing as expected, the vehicle's engine control module (ECM) triggers the code.
Symptoms
What are the symptoms of the P2431 code?
- Check Engine Light (CEL) illuminated
- Poor engine performance or rough idling
- Increased emissions output
- Engine running rich or failing emissions tests
Causes
What causes the P2431 code?
- Faulty secondary air injection system air flow/pressure sensor
- Damaged wiring or connectors in the sensor circuit
- Vacuum leaks affecting the sensor readings
- Malfunctioning secondary air pump
- ECM software issues
Possible Solutions
How to fix P2431?
- Inspect and test the secondary air injection system air flow/pressure sensor for proper operation
- Repair or replace any damaged wiring or connectors
- Check for vacuum leaks and fix as necessary
- Replace the secondary air pump if it is not functioning
- Update or reprogram the ECM if software issues are present