P2431AIR System Air Flow/Pressure Sensor Circuit Range/Performance (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2431 flags a bank 1 secondary air pressure signal that can be read but makes no sense. The usual check compares the sensor with barometric pressure: with the pump off both should agree, with the pump running the rise must stay within limits. GM sets the code on the 3.8L V6 (2005–2006) when the gap exceeds 10 kPa with the pump off or 50 kPa with it on for over 30 s, Type B; the 2018 table works with 15 kPa and 50 kPa. Volkswagen's 2014 Beetle 1.8 TSI allows a deviation of up to 60 hPa from ambient pressure, the Golf CBFA engine only 25 hPa. GM bulletin PIP4409E links P2431 on Colorado, Canyon and H3 to broken MAP sensor wires, because the comparison relies on a correct baro value. Pure circuit faults go under P2432/P2433.
- What you may notice
- Check engine lamp, often only after cold starts
- Secondary air monitor not completed
- Possibly further MAP or lean codes if the reference is wrong
- Likely causes
- LikelyPressure sensor drifted or reacts too slowly
- PossibleWrong barometric reference, e.g. damaged MAP sensor wiring
- PossibleRestricted or leaking air duct around the sensor port
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.