P2031Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 2)
- 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
- Exhaust gas temperature sensor 2 on bank 1 usually sits between the oxidation catalyst and the particulate filter, where the ECM uses it to control regeneration temperature. Under the generic circuit title, manufacturers set P2031 for different faults. On Ford's 2023 diesels it is a plausibility test: after at least 6 hours off, all sensors must agree within 50 °C at key-on, and while driving each must stay within ±80 °C of the modelled temperature for 200 to 400 s, with the fault confirmed after 20 s. Mack and Volvo trucks use P2031 with a failure mode identifier for open or shorted wiring, connector faults and failed sensors, and note that regeneration is then not possible. Stellantis found water and corrosion in the sensor and harness connectors and replaces both. P2032 and P2033 are the dedicated low and high signal codes.
- What you may notice
- Malfunction indicator lamp on
- DPF regeneration inhibited
- Likely causes
- LikelySensor failed or reading off from the model
- PossibleWater or corrosion in the sensor or harness connector
- PossibleWiring open or shorted near the hot exhaust
- 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 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.