P2024
Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Circuit
- Severity
- Low
- Driving
- No driving restriction
A fault in the EVAP fuel vapour temperature sensor circuit. The evaporative emissions system captures fuel vapour from the tank, and the module uses vapour temperature to interpret its leak tests correctly - vapour pressure changes with temperature, so without it a healthy system can look like a leak.
Possible causes
- CommonFailed fuel vapour temperature sensor
- CommonCorroded or water-ingressed connector - this sensor lives underneath
- CommonDamaged wiring under the vehicle
- PossibleLoss of reference voltage or earth
- PossibleRodent damage to the harness
What you might notice
- Check engine light on
- Failed emissions test
- EVAP leak tests not completing
- Usually no symptom the driver notices
What to check, in order
- Compare the reported vapour temperature with ambient on a vehicle that has stood overnight - they should be close.
- Inspect the connector for corrosion and water. This sensor is mounted under the vehicle and takes constant road spray.
- Check the wiring underneath for damage, including rodent damage.
- Check the reference voltage and earth before condemning the sensor.
- Note that EVAP monitors only run in particular conditions - fuel level, temperature and time since start - so testing this may take several journeys.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Fuel, air metering and auxiliary emission controls
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