P0240 Code: Turbocharger Boost Sensor B Circuit Range/Performance
🟠 Moderate severity · drivable
Drivable, but the second boost reading is off, which can affect power and acceleration.
What P0240 means
The boost pressure sensor B is sending a signal that's outside the expected range. The reading doesn't match what the engine should be producing, so the computer may limit boost and reduce power.
Symptoms
- Check engine light is on
- Loss of power
- Poor acceleration
- Possible surging under boost
Common causes
- most common: Faulty boost pressure sensor
- common: Leaking or blocked hose to the sensor
- common: Boost or vacuum leak in the intake system
- less common: High-resistance sensor wiring
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the boost pressure sensor | Yes | $50–150 |
| Inspect and replace the sensor hose | Yes | $10–50 |
| Repair boost or vacuum leaks | Mechanic | $50–200 |
Frequently asked questions
Can I drive with a P0240 code?
Yes, but power may be reduced. Fix it soon to restore normal acceleration.
What causes a P0240 range/performance code?
A faulty boost sensor, a leaking or blocked sensor hose, or a boost/vacuum leak.
How much does it cost to fix a P0240?
Typically $50–150 for a new sensor, or $10–50 if a hose replacement fixes it.
Related codes
P0239
P0239 Code: Turbocharger Boost Sensor B Circuit Malfunction
P0241P0241 Code: Turbocharger Boost Sensor B Circuit Low Input
P0242P0242 Code: Turbocharger Boost Sensor B Circuit High Input
Related guide: The 10 Most Common Check Engine Codes →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.