OBD-II code · Powertrain (generic)
P0187 Fuel Temperature Sensor B Circuit Low Input
Fuel temperature sensor B signal below minimum. Shorted to ground or sensor open. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P0187?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to ground
- PossibleSensor failed
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Temperature Sensor B, Sensor Wiring
Related codes
- P0182Fuel Temperature Sensor A Circuit Low Input
- P0184Fuel Temperature Sensor A Circuit Intermittent
- P0185Fuel Temperature Sensor B Circuit Malfunction
- P0186Fuel Temperature Sensor B Circuit Range / Performance
- P0188Fuel Temperature Sensor B Circuit High Input
- P0189Fuel Temperature Sensor B Circuit Intermittent
- P018AFuel Pressure Sensor B Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.