What it means
The EVAP fuel-vapor temperature sensor reading is plausible but does not match expected behaviour over time or temperature — slow response, incorrect offset, or stuck reading.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The EVAP fuel-vapor temperature sensor reports vapor temperature so the control module can evaluate evaporative-emissions system conditions. P2025 sets when the signal remains electrically plausible but its change over time or temperature does not match expected sensor behavior.
Common causes
Most likely first.
- Sensor drift over service life
- Sensor element aged beyond calibration window
- Sensor element contaminated by oil, soot or coolant
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
How to diagnose it
- Review freeze-frame data and graph the EVAP vapor-temperature reading during a cold-to-warm period to check for a stuck or unusually slow response.
- Compare the sensor reading with ambient and nearby fuel-system temperatures under similar conditions, allowing for normal heat soak.
- Inspect the sensor and its connector for contamination, moisture, poor terminal contact, or harness damage.
- Check sensor power, ground, and signal behavior against the manufacturer's procedure to rule out circuit resistance or wiring faults.
- If the circuit is sound, test the sensor response across the specified temperature range and compare it with the manufacturer's specification.
Common fixes
- Repair poor terminal contact or wiring resistance affecting the sensor signal.
- Clean contamination from the connector if the manufacturer permits it and restore its seal.
- Replace a sensor that responds slowly, stays fixed, or is out of specification.
- Clear the code and confirm the temperature reading tracks changes after the repair.
Can I keep driving?
The fault usually does not affect basic driving, but EVAP monitoring may be incomplete and the vehicle may fail an emissions inspection. If there is a fuel smell, avoid ignition sources and investigate promptly.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.