Turbocharger/Supercharger Boost Sensor B Intermittent/Erratic

Where it lives

For P025F, start at the sensor the description names.

Check these first

• An intermittent connection in the boost sensor B wiring
• A faulty boost sensor B
• Corrosion or water in the sensor B connector
• A calibration or installation fault
• A boost or vacuum leak

What to do next

1. Watch boost sensor B on a scan tool while wiggling the harness
2. Inspect the sensor B connector and wiring for corrosion or water
3. Compare sensor B against a mechanical boost gauge
4. Smoke test the charge piping and vacuum lines
5. Replace boost sensor B if the signal is erratic
6. Clear the code and retest

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