P0186
Fuel Temperature Sensor B Circuit Range / Performance
Fuel temperature sensor B reading is within electrical limits but implausible (no warmup change, disagrees with sensor A or ambient).
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Sensor driftedCommon
- Sensor stuckPossible
Parts involved
- Fuel Temperature Sensor B
P0186 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.