P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input

P0107 indicates a low input from the manifold absolute pressure or barometric pressure circuit. The signal is lower than the module expects for the current operating state.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not assume high engine vacuum is the cause; low input can be an electrical fault in the signal, reference, or ground path.

Symptoms of P0107

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0107

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Check MAP sensor reference voltage, ground, signal voltage, connector condition, and harness damage.
Compare scan-tool MAP data to actual manifold vacuum or barometric pressure where practical.
Inspect the sensor port and vacuum path for blockage, contamination, or an incorrect hose connection.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.