P3003moderate severityPowertrain
Turbo/Supercharger Boost Pressure Sensor Circuit Intermittent
on 2021 Mazda Mazda3 2.0L I4 · AWD
What this code means
The boost pressure sensor signal is intermittent, causing erratic boost control. The PCM detects signal dropouts or sudden voltage changes.
Symptoms
- Check Engine Light intermittent
- Fluctuating boost gauge
- Inconsistent power delivery
- Occasional limp mode
- Surging under load
Common causes
- Loose boost pressure sensor connector
- Damaged sensor wiring
- Faulty boost pressure sensor
- Vibration-related intermittent contact
- Corroded sensor pins
Diagnostic steps
- Monitor boost pressure PID for signal dropouts
- Wiggle test on sensor connector while monitoring data
- Inspect sensor connector pins for corrosion
- Check wiring harness routing near heat sources
- Swap sensor with known good unit if available
Repair notes
Replace boost pressure sensor or repair intermittent wiring connection.
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