P0187 — Fuel Temperature Sensor B Circuit Range/Performance
Drive with caution — fix soon.
What P0187 means
This code means the fuel temperature sensor B is sending a reading that doesn't match what the computer expects for the current conditions, so the value is considered out of range or implausible. It often points to a failing sensor, but can also be caused by wiring problems or a poor connection. It's usually fixable by testing and replacing the sensor or repairing its circuit, without major engine work.
Common symptoms
- Check engine light is on
- Slightly rough running or hesitation
- Minor drop in fuel economy
- Harder starting in hot or cold conditions
- No obvious symptoms in some cases
Common causes
- Faulty fuel temperature sensor B
- Corroded or loose sensor connector
- Damaged or chafed sensor wiring
- Poor ground or open circuit to the sensor
- Engine control module reading drift or fault
Typical repair cost
$120 – $350
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0187 code?
Usually yes, at least for short-term driving, since this is mostly a sensor accuracy issue rather than a breakdown. Just don't let it linger for weeks, and get it checked if you notice rough running or hard starting.
How much does it cost to fix a P0187 code?
Most repairs run between $120 and $350, depending on whether it's just the sensor or also wiring work. Diagnosis is usually quick, and the sensor itself is typically an affordable part.
Is a P0187 code serious?
It's generally a low-to-moderate concern. The engine can run slightly worse and use a bit more fuel, but it rarely leaves you stranded. Still, fixing it keeps your fuel system running correctly.
What does the 'B' mean in this fuel temperature code?
The 'B' refers to a specific fuel temperature sensor, since some vehicles use more than one. It tells the mechanic exactly which sensor circuit the computer flagged.