P0185
Fuel Temperature Sensor B Circuit Malfunction
The ECU detects an electrical fault in the fuel temperature sensor B circuit (second sensor used on systems with separate supply/return temperature monitoring or twin-tank arrangements).
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Sensor failedCommon
- Wiring or connector faultPossible
Parts involved
- Fuel Temperature Sensor B
- Sensor Wiring
P0185 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.