P2028
EVAP Fuel Vapor Temperature Sensor Circuit Intermittent
The EVAP fuel-vapor temperature sensor signal jumps or drops out intermittently — usually a connector or chafed wire.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Common causes
Ordered by how often each turns out to be the cause.
- Intermittent connector or chafed wireCommon
- Connector with intermittent contact under vibrationLess likely
- Harness routed against vibrating componentLess likely
Parts involved
- EVAP Fuel Vapor Temp Sensor
- EVAP Harness
P2028 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.