OBD-II code · Powertrain (generic, extended)
P2431 Secondary Air Injection System Air Flow/Pressure Sensor Circuit
The ECU detects a general fault in the secondary air injection system air flow or pressure sensor circuit. The diagnostic cannot verify proper SAI operation.
Is it safe to drive with P2431?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyDefective SAI sensor
- PossibleSAI sensor wiring fault
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Sai Pressure Sensor, Sai Wiring
Related codes
- P242EExhaust Gas Temperature Sensor Circuit Intermittent or Erratic Bank 1 Sensor 3
- P242FParticulate Filter Restriction Ash Accumulation Bank 1
- P2430AIR System Air Flow or Pressure Sensor Circuit Bank 1
- P2432Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance
- P2433AIR System Air Flow or Pressure Sensor Circuit High Bank 1
- P2434AIR System Air Flow or Pressure Sensor Circuit Intermittent or Erratic Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.