P0242 Code: Turbocharger Boost Sensor B Circuit High Input
🟠 Moderate severity · drivable
Drivable, but the boost reading is too high, which may point to overboost — fix it soon.
What P0242 means
The boost pressure sensor B is sending voltage that's too high, which the computer reads as too much boost. This can be a faulty sensor or a genuine overboost condition from a wastegate or boost control problem.
Symptoms
- Check engine light is on
- Loss of power or limp mode
- Possible surging under acceleration
Common causes
- most common: Faulty boost pressure sensor
- common: Genuine overboost condition (wastegate or boost control fault)
- less common: Wiring shorted to power in the sensor circuit
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the boost pressure sensor | Yes | $50–150 |
| Diagnose and repair an overboost condition (wastegate, boost control solenoid) | Mechanic | $100–400 |
Frequently asked questions
Can I drive with a P0242 code?
Yes, but avoid hard acceleration until the boost problem is fixed.
What is the most common cause of P0242?
A faulty boost sensor, though a genuine overboost condition is also possible.
How much does it cost to fix a P0242?
Typically $50–150 for a new sensor, or $100–400 for wastegate or boost control repairs.
Related codes
P0239
P0239 Code: Turbocharger Boost Sensor B Circuit Malfunction
P0240P0240 Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0241P0241 Code: Turbocharger Boost Sensor B Circuit Low Input
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.