Powertrain, generic · Fuel and air metering (injector circuit)

P023E Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor B Correlation

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Boost sensor B or manifold sensor drifting
Contact resistance at sensor B's connector or wire
Pressure port blocked

Symptoms

  • Check engine light on
  • Possibly limited power
  • Otherwise unremarkable

Repair estimate

DifficultyEasyDIY possible
Parts and labour€40–250
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

manifold absolute pressure sensorboost pressure sensor bsensor wiring

Related codes

P023DP0240P0241P0242P0106

References: law.cornell.edu, saabwisonline.com, en.wikipedia.org.