Error code
OBD2 P2431
OBD2P2431
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance.
Severity
moderateCan be driven, but performance may suffer and emissions could increase.
Summary
P2431 indicates an issue with the air flow/pressure sensor in the secondary air injection system on bank 1, suggesting that the sensor is not functioning properly within its expected range.
Common Causes
- Wiring issues related to the air flow/pressure sensor
- Faulty air flow/pressure sensor
Fixes
- Replace the faulty air flow/pressure sensor.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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- P2403Evaporative Emission System Leak Detection Pump Sense Circuit/Open
- P2404Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance
- P2405Evaporative Emission System Leak Detection Pump Sense Circuit Low
- P2406Evaporative Emission System Leak Detection Pump Sense Circuit High
- P2407Evaporative Emission System Leak Detection Pump Sense Circuit Intermittent/Erratic
- P2408Fuel Cap Sensor/Switch Circuit
- P2409Fuel Cap Sensor/Switch Circuit Range/Performance
- P2410Fuel Cap Sensor/Switch Circuit Low
- P2411Fuel Cap Sensor/Switch Circuit High