P2024EVAP Fuel Vapor Temperature Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- The fuel vapor temperature sensor tells the ECM how warm the vapor in the tank and canister is, which matters for leak tests that judge pressure or vacuum as the fuel cools after shutdown. P2024 is the unspecified electrical code for that circuit. On recent Audi models the sensor is built into the leak detection unit J909 at the charcoal canister. An Audi bulletin first issued in 2023 and revised in September 2026 covers 2022–2025 A3 to Q8 models: four-cylinder engines could store P2024, described as an electrical fault of the tank breather temperature sensor, although guided diagnosis expects P2026 for a low voltage at J909. The fix there is to follow the corrected test, not to replace parts. Without valid temperature the EVAP leak test cannot complete.
- What you may notice
- Check engine lamp on
- EVAP readiness not set, possible inspection failure
- Likely causes
- LikelyOpen or shorted wiring to the temperature sensor or leak detection unit
- PossibleMisassigned fault entry in the ECM software (Audi 2022–2025)
- PossibleLeak detection unit with integrated sensor faulty
- 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: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.