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.
Low severity. Can I keep driving?Yes, you can normally keep driving. If there is a strong smell of gasoline, find the leak before continuing and do not smoke nearby.
Symptoms
- Check engine lamp on
- EVAP readiness not set, possible inspection failure
Most likely causes
- Open or shorted wiring to the temperature sensor or leak detection unit
- Misassigned fault entry in the ECM software (Audi 2022–2025)
- Leak detection unit with integrated sensor faulty
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P2024 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 0: Subsystem depends on the code range
- 24: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2024?
Yes, you can normally keep driving. If there is a strong smell of gasoline, find the leak before continuing and do not smoke nearby.
What causes code P2024?
The most common causes are: open or shorted wiring to the temperature sensor or leak detection unit; misassigned fault entry in the ECM software (Audi 2022–2025); leak detection unit with integrated sensor faulty.
Related codes
- P2025EVAP Fuel Vapor Temperature Sensor Performance
- P2026EVAP Fuel Vapor Temperature Sensor Circuit Low Voltage
- P2027EVAP Fuel Vapor Temperature Sensor Circuit High Voltage
- P2028EVAP Fuel Vapor Temperature Sensor Circuit Intermittent
- P0450EVAP System Pressure Sensor/Switch A Circuit
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.