Powertrain
generic / SAE
P0240
Turbocharger/Supercharger Boost Sensor B Circuit Range/Performance
Boost pressure sensor B reading implausible. Boost control tracks commanded vs. actual manifold pressure; persistent deviation means wastegate, vanes, hose or actuator are not delivering the requested pressure.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number2 / 40
Possible causes
- Sensor reading drifted high
- Sensor element aged beyond calibration window low
- Sensor mounting loose - signal damping low
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–500 €
- Estimated time: 0.5–2 h
- Component: boost pressure sensor b
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012