P0189
Fuel Temperature Sensor B Circuit Intermittent
The ECU detects intermittent dropouts on the fuel temperature sensor B circuit. Loose connector, chafed wiring or sensor failing under thermal load.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Connector loose or corrodedCommon
- Wiring chafedPossible
- Connector with intermittent contact under vibrationLess likely
Parts involved
- Fuel Temperature Sensor B
- Sensor Connector
P0189 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.