P2025

Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Performance

Severity: Low
Driving: No driving restriction

The EVAP fuel vapour temperature sensor is answering, but the value is not plausible - it does not change with conditions, or disagrees with ambient temperature.

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.

Get Pin16 on Google Play

Where this code sits

B · Body C · Chassis P · Powertrain U · Network and communication

Fuel, air metering and auxiliary emission controls