P0109moderate severityPowertrain
MAP/BARO Pressure Circuit Intermittent
on 2009 Subaru Legacy 3.0L H6 · AWD
What this code means
The MAP sensor signal is showing intermittent readings.
Symptoms
- Check Engine Light (intermittent)
- Erratic idle
- Stumble on acceleration
Common causes
- Loose connector
- Damaged wiring
- Intermittent vacuum leak
Diagnostic steps
- Wiggle test on connector
- Monitor MAP signal
- Check vacuum hose
Repair notes
Repair connector or wiring.
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