P0109Honda CivicYears: 1996 - 2026
MAP/Barometric Pressure Circuit Intermittent
Reviewed by ASE Certified Technician
What does this mean?
Code P0109 indicates an intermittent signal from the MAP/Barometric pressure sensor, where the voltage fluctuates erratically.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Honda Civic models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
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Common Causes
Faulty MAP (Manifold Absolute Pressure) sensor
Damaged, chafed, or broken wiring harness
Corroded or loose electrical connector
Symptoms to Watch For
- Check Engine Light is illuminated
- Rough or unstable idle
- Engine surging or fluctuating RPM
- Hesitation or stumble during acceleration