P023EManifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor B Correlation
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Boost sensor B is a second boost pressure sensor, for a second turbo or bank on parallel twin-turbo engines or a second stage on two-stage systems. No manufacturer using sensor B codes was found – GM, Ford and Saab, even on two-stage and twin-turbo engines, use a single boost sensor; the description follows CARB and the documented sensor A codes. P023E is the counterpart of P023D: manifold pressure is compared with boost sensor B, and with the engine stopped both must read ambient pressure. Saab sets the sensor A version at a difference of more than 12 kPa; a deviation beyond the manufacturer's limit sets this code.
- What you may notice
- Check engine light on
- Possibly limited power
- Otherwise unremarkable
- Likely causes
- LikelyBoost sensor B or manifold sensor drifting
- PossibleContact resistance at sensor B's connector or wire
- RarePressure port blocked
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €40 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.